Corrugation for the chimney: pros and cons, installation procedure – the device and installation of corrugation for the chimney

For many homeowners, keeping their house warm and comfortable throughout the winter is of utmost importance. The chimney is one important part of a heating system that works properly. It provides ventilation as well as a safe exit route for gases and smoke from your house. It’s critical to take corrugation into account if you want to guarantee the effectiveness and security of your chimney.

Corrugation, sometimes referred to as a flue liner or chimney liner, is an essential component that keeps your chimney safe from harm and enhances its overall functionality. But what is corrugation exactly, and what are the benefits and drawbacks of it? Now let’s explore this crucial facet of chimney installation and upkeep.

Let’s start by discussing the benefits of utilizing corrugation for your chimney. Enhancing the draft inside the chimney is one of its main advantages. A continuous, smooth flow of gases and smoke is necessary for effective heating and a lower chance of carbon monoxide accumulation. This is made possible by corrugation, which offers a smooth interior surface that improves airflow.

Additionally, the interior walls of your chimney are shielded by corrugation. The extreme heat and corrosive combustion byproducts can weaken the chimney structure over time, necessitating expensive repairs and creating safety risks. By adding corrugation, you can extend the chimney walls’ lifespan and guarantee continuous functionality by forming a strong layer that protects them from harm.

Corrugation, like any home remodeling material, is not without its disadvantages, though. The installation’s initial cost is one thing to take into account. Corrugation can have substantial upfront costs, but by preventing chimney damage and increasing efficiency, it may end up saving you money over time. It’s critical to balance the immediate financial outlay with the long-term benefits.

The corrugation installation process is an additional consideration. Although it has many advantages, incorrect installation can reduce its efficacy and safety. To guarantee correct corrugation liner fitting and sealing, it is essential to adhere to the manufacturer’s instructions and hire qualified experts.

To sum up, installing corrugation on your chimney is a useful way to improve the longevity and efficiency of your heating system. When installed properly, its benefits—such as better protection and draft—outweigh any potential disadvantages. You can benefit from a safer and more effective home heating experience by being aware of the benefits and drawbacks of corrugation and by following the right installation procedures.

Pros	Cons and Installation Procedure
1. Provides flexibility to the chimney structure, allowing for expansion and contraction due to temperature changes.	1. Installation may require professional expertise to ensure proper fitting and sealing. 2. Corrugation can accumulate creosote buildup, requiring regular cleaning to prevent chimney fires. 3. Installation involves threading the corrugated sections onto the chimney pipe and securing them with appropriate fasteners.

What is good corrugated pipe for chimney made of stainless steel and aluminum, where used

A complicatedly constructed chimney can be costly because so many fittings—angles, adapters, fasteners, etc.—are required. Because of this, the price of the chimney system may rise several times if beams, floor slabs, or another reason necessitate the pipe being moved to the side.

Purpose

A flue pipe that will transport carbon monoxide to the street without endangering the occupants of the home is necessary for the elimination. For a gas heater, you can install the chimney on your own.

Corrugated flue pipes for gas boilers

Because of the material’s high technical qualities, flexible metal chimney corrugation can be used with gas boilers and other heating equipment. There are numerous crucial factors to take into account: After using aluminum pipes for a few years, they can burn through. Therefore, it is preferable to select a stainless steel sleeve if connecting a corrugated chimney is necessary.

The material’s ability to conserve heat is inadequate. It will be required to install heat and sound insulation on the corrugated tube in order to lessen the production of condensation. It is possible to use 5 cm thick non-combustible mineral insulation for this purpose. The pipe is encased in thermal insulation, and any foil reflector is placed on top. A knitting wire holds it in place.

Corrugated chimneys for gas stoves

It makes perfect sense to install a corrugated chimney in the kitchen, instead of the typical gas column. Although the temperature rises to 1000–1200 °C inside the boiler, it drops sharply to 200–300 °C at the outlet. At these temperatures, even aluminum pipes remain strong and tight.

Considerations to make before attaching the heater to the chimney with a corrugated pipe Diameter: The dimensions and cross-section of the pipe that connects to the outlet pipe must be specified in the technical documentation for the column. Using an aluminum pipe with a smaller cross-section is strictly prohibited. This causes the structure to heat up more, which typically results in burning, deformation of the walls, and a loss of tightness.

Repair of chimneys with corrugated pipe

An old brick chimney can be cleaned with the corrugated sleeve. This is how the repair process is executed. The heater is connected to an older chimney channel by means of a smaller diameter corrugated pipe.

The purpose of sealing a stove chimney is as follows:

Reducing the volume of condensate falling out. The metal is heated above the "dew point" much faster, therefore, the appearance of moisture on the inner walls is reduced.

No soot: The pipe’s smooth inner walls prevent soot from building up inside the chimney. lessens the possibility of fire. Burning soot raises the temperature of the chimney to 1000°C.

Elimination of depressurization: A brick chimney loses its tightness after ten to fifteen years of use. When there’s no draft, smoke literally "comes in through all the gaps" in the wall. Installing sleeving results in the chimney system becoming tight again. It makes perfect sense to use corrugated pipe to gild old brick chimney ducts. However, since exhaust gas temperatures frequently approach 600 °C, using a stainless steel pipe is advised for this purpose. The best option for chimney systems with axis curvature is to install a corrugated chimney within a brick chimney.

The use of corrugated to connect to the main chimney

"Connection of gas equipment to chimneys should be provided by connecting pipes made of roofing steel…, flexible metal corrugated branch pipes…supplied with the equipment," the SP states regarding the connection of a flexible corrugated chimney used for a gas boiler. The usage of aluminum sleeves for this purpose restricts the connection of gas equipment to the corrugated spigots in chimneys. Experience has demonstrated that aluminum is easily distorted by high temperatures.

There are areas of the Russian Federation where it is forbidden to use aluminum corrugated pipe as a chimney spigot. Furthermore, the ban is not supported by laws and is primarily linked to the rise in sleeve burnout cases and the carbon monoxide poisoning that results for the owners.

Whether it is possible to install a corrugated chimney pipe

Boilers, stoves, and other appliances can all be used with a corrugated pipe chimney. Corrugated pipes are used to finish heating equipment that runs on pellets, gas, wood, and solar energy.

Currently, there are two primary product categories with identical designs but different materials of construction. Products composed of aluminum and stainless steel are offered to customers.

What pipe is better to use – flexible or rigid?

Installing corrugated stainless steel chimneys on gas boilers is significantly quicker and easier. Accessories and installation are less expensive. However, this is where the material’s primary benefits stop.

A chimney pipe is a better fit for a rigid pipe. Completely conforms to all safety regulations and doesn’t elicit remarks from gas service personnel.

If you decide to purchase one, it is best to get a rigid stainless steel pipe based on the kind of sandwich construction. This solution will guarantee the highest level of safety when using gas and solid fuel to operate home heating appliances.

Can a corrugated chimney burn through?

As previously mentioned, the primary cause for the prohibition of aluminum corrugated chimney use by gas industry representatives is that the walls become deformed and can even burn through the chimney when heated. Although it happens infrequently, aluminum corrugated pipe burnout can result in fire.

Flexible stainless steel corrugated pipe for chimneys offers complete operational safety in contrast to its aluminum counterpart, but it is nearly three times more expensive. Buying only certified products is advised.

Producers of corrugated stainless steel chimneys available on the domestic market include Lex, Rosinox, Alta, and other businesses. Technology and service life should be taken into consideration when making a decision. The Lex Flex corrugated stainless steel chimney with a high temperature flue has a minimum 40-year service life.

What corrugations are used for chimneys

When connecting to heating equipment that runs on any kind of fuel, installing a corrugated chimney is advised as long as low- and high-temperature flue gases are released.

• The body is made in the form of a cylindrical tube, twisted into a spiral. The strips are connected to each other with a special lock seam.

Two varieties of aluminum and stainless steel pipes are available to consumers.

Stainless steel chimneys that are flexible

The best choice for connecting to equipment that produces high-temperature exhaust gases, such as wood stoves, fireplaces, and pellet boilers, is corrugated stainless steel for the chimney. Corrugated stainless steel can be heated to 900 °C without losing its sealing.

• Steel thickness from 0.12 to 1 mm.

Corrugated aluminum pipes to remove smoke

The stainless steel aluminum corrugation for the chimney is designed in the same way as the analog model. Aluminum, however, pales in comparison to the latter in terms of strength and heat resistance.

How to choose a corrugation for the chimney

Is it feasible to make a chimney out of corrugated material, and what factors need to be considered?

Its applicability as well as the primary selection criteria are established:

• NPB 252-98. The document regulates the requirements for heat-generating appliances, methods of their testing and fire safety rules;
• SP 42-101-2003, which defines the rules of construction and design of smoke exhaust systems;
• SP 60.13330.2012, which establishes the rules for the manufacture and use of air ducts, heating and air conditioning systems.

Therefore, in line with the aforementioned documents, the following considerations must be made when selecting a stainless corrugated chimney:

1. diameter. To maximize the removal of combustion products, it is necessary that the diameter of the hood is not less than the corresponding parameter of the outlet pipe of the installed equipment;
2. equipment capacity. The parameter affects the determination of the length and diameter of the chimney;

Exhaust parameters’ dependence on boiler output

1. tightness class.

Watch the video to learn how to select the appropriate chimney pipes.

Scope of application of corrugations for chimneys

Corrugated stainless steel pipe can withstand temperatures up to 900°C without losing wall integrity. This feature makes it possible to manufacture chimney systems and perform repairs using corrugation.

• Connection of gas boilers and columns.

Every situation has subtleties and characteristics that need to be considered when installing something.

Because of the material’s high technical qualities, flexible metal chimney corrugation can be used with gas boilers and other heating equipment. In this instance, it is important to consider a number of factors:

• Aluminum pipes can burn through after a few years of operation. Therefore, if there is a need to connect the chimney from the corrugation, it is better to choose a sleeve made of stainless steel.

The pipe is encased in thermal insulation, and any foil reflector is placed on top. securing with a binding wire.

It makes sense to install a corrugated chimney in the kitchen, which is where gas heaters are typically located. Although the temperature rises to 1000–1200 °C inside the boiler, it falls sharply to 200–300 °C at the outlet. At these temperatures, even aluminum pipe will not lose its strength or tightness.

• Diameter – the technical documents for the column should specify the size and cross-section of the pipe connected to the outlet spigot. It is strictly forbidden to use an aluminum pipe with a smaller cross section. This leads to increased heating of the structure and, as a rule, deformation of the walls, burning, loss of tightness.

An old brick chimney can be cleaned with a corrugated sleeve. This is how the repair process is executed. The heater is connected to a smaller diameter corrugated pipe that is placed into the original chimney channel.

• Reducing the volume of condensate. The metal is heated above the "dew point" much faster, therefore, the appearance of moisture on the inner walls is reduced.

Connecting to the main chimney with a corrugated sleeve

DBN B 2.5-20-2001 permits the flexible chimney corrugation from the gas boiler to be connected to the pipe. It says explicitly that "Roofing steel connecting pipes should be used for connecting gas equipment to chimneys." by pliable, corrugated metal spigots that are provided with the necessary tools.

Rules of installation of corrugated chimneys

It is far simpler to mount the corrugated pipe for the flue gas outlet correctly than it is to install and connect the chimney separately using sandwich pipes. However, there are a few crucial things to think about when installing:

• Diameters of corrugated pipes – is selected depending on the capacity of boilers and columns. Equipment up to 19 kW is connected to a 110 mm hose, above – to a 130 mm hose.

The corrugated pipe is installed simply by placing it on the outlet pipe and tightening the clamp. The pipe is extended to the necessary length. Brackets are used to fasten the corrugations along the whole length of the laying.

The cost of a set of corrugations for the chimney

Several crucial factors must be considered in order to determine the corrugation’s cost:

• The total length of the chimney. The standard equipment includes an aluminum tube capable of stretching from 0.65-3 p. м. Stainless steel corrugation stretches insignificantly, so when calculating it is necessary to take the length that is indicated on the package. Buy one aluminum sleeve can be for 350-380 rubles. Stainless pipe will cost 650-700 rubles. per 1 p. м.

The pipe’s diameter should be less than the brickwork’s inner channel if the corrugated aluminum material for the sanitation chimney—which wood stoves use—is chosen.

Like any other chimney system, using fireproof metal corrugated chimneys for boilers and stoves has benefits and drawbacks. The primary focus should be on both the technical properties of the material and the safety of operation.

As previously mentioned, the primary cause for the prohibition of using aluminum corrugated chimneys by gas industry representatives is that the walls can literally burn through when heated. Fire from aluminum corrugated pipe can occur, albeit infrequently.

Installing corrugated stainless steel chimneys on gas boilers is significantly faster and less complicated. Accessories and installation are less expensive. However, this is where the material’s primary benefits stop.

In the quest to make our homes warmer and more energy-efficient, the chimney plays a crucial role. Corrugated pipes for chimneys have emerged as a solution, offering both advantages and disadvantages worth considering. These flexible pipes are easier to install compared to traditional rigid chimneys, making them a popular choice among homeowners. However, their flexibility can sometimes lead to issues with stability and durability, especially in extreme weather conditions. Understanding the installation process is key, involving careful fitting and sealing to ensure optimal performance. While corrugated chimneys offer flexibility and ease of installation, it"s essential to weigh their pros and cons before making a decision, ensuring that your home stays warm and safe throughout the seasons.

The material of manufacture of corrugated pipes

Selecting the appropriate pipe type is essential, depending on how the pipes will be used. The following materials can be used to make corrugated chimneys.

Stainless steel

These products are unique in that they have a long service life. The following benefits need to be considered when choosing

• Long service period. The product is not subject to corrosion and will serve for a long period of time without reducing its characteristics.
• Flexibility. Allows you to easily lay pipes in the necessary direction.
• Reliability. Can be used not only for interior work, but also for exterior work. It has a high degree of resistance to temperature fluctuations.
• Convenient transportation.

Because of the material’s appealing appearance and low susceptibility to pest damage, pipes can be used without causing damage to the room’s interior. made from both heavy and light alloys. Products made of heavy metal are utilized in underground construction. may become rusted over time if used extensively.

Aluminum products

Pipes of this type can be used in a variety of fields. Both home and industrial use are acceptable. Benefits of construction materials:

• flexibility, the material can be bent in the desired direction without fractures;
• no corrosion and mold;
• easy to install;
• low weight there is no need to install additional supports.

It should be mentioned, though, that the product is easily distorted by mechanical force. Most frequently utilized for air ducts and ventilation systems.

PVC pipes

The product offers the following benefits and is utilized for a variety of communications:

• Availability of resistance to high temperature;
• do not emit harmful components, so they can be used for internal arrangement of premises;
• long service life without the appearance of mold and corrosion.

Aside from a long list of advantages, one must mention a drawback like an intolerance for cold temperatures.

Polyethylene pipes

Construction companies are increasingly using this kind of material. The following are some benefits of pipes:

• does not appear corrosion, so these products are often used for sewerage;
• low cost;
• withstands heavy mechanical loads;
• The product is compact and can be transported to a long distance.

It’s crucial to be aware that these species are not UV-resistant when selecting one.

Corrugated stainless steel pipe for the chimney

It is crucial to note during construction if the chimney’s trajectory is slightly altered, meaning it bends either smoothly or sharply instead of going straight. You will need to use connecting elements in this situation, which is not very convenient and expensive as well. Therefore, you can use corrugated pipe to save money on the family budget and prevent such inconveniences. When it comes to water and chimney pipes, corrugated stainless steel pipes are the best choice.

Stages of production of corrugated stainless steel pipe

The corrugations on this type of pipe provide it a unique design that gives it a high degree of flexibility.

The multifunctionality and superior quality indicators of stainless steel corrugation can be attributed to the rigorous adherence to the manufacturing technology, which is surprisingly straightforward. The steps involved in the manufacturing process are as follows:

1. Form the pipe using a special steel strip.
2. The workpieces are welded using tungsten electrodes. At this stage of production, special automatic TIG equipment is used. The process takes place at a high temperature, which can reach 1150 ° C.
3. The reliability of the seams is checked on a special laser installation.
4. Form the corrugation with the use of special shafts of various diameters.
5. Heat treatment of parts is performed. Different types of pipe lend themselves to a certain degree of temperature exposure, as annealed pipe has a higher degree of flexibility.
6. Packaged products. Pipes are divided into sections of a certain length. Products with small diameters are coiled and thicker parts are packed in groups.
7. The quality is checked and rejected in the form of products with micro cracks. For this purpose, the metal corrugated tube is placed in a liquid under high pressure. In this case, a special device is attached to each coil and gradually increase the pressure up to 10 atmospheres, then it is gradually reduced.

Design features and application

As previously mentioned, any boiler or heating system that runs on gas, briquettes, pellets, or logs can use a flexible corrugated stainless steel chimney.

If we were to look more closely at the potential uses, we would find that the corrugated chimney pipe is suitable for:

• Installation of chimney systems located inside the house;
• Installation of exhaust structures located on the street side;
• Individual parts and elements can serve as an addition to other ventilation or heating systems and are used as adapters (serve as a connector between the inlets and the main part of the chimney system);
• They are used in repair works, also they can partially replace some sections of brick chimney structures, especially in places of bends and turns.

Despite its light weight, the pipe is easily distorted.

1. Chimney flexible corrugated stainless steel has a cylindrical shape and consists of many spirals, which have a thickness ranging from 0.11 to 1.5 millimeters;
2. In order to create maximum tightness of all connections of the structure, tightening is made by means of a lock seam. This element is also responsible for such parameters as flexibility, compression and the possibility of installation and placement at any angle and inclination;
3. If necessary, you can individually select the diameter of pipes, based on the characteristics of your heating boiler;
4. Fastening of each element and its connection with the previous one is made by means of special clamps, which provide a high degree of tightness, insulation and increase the strength of such a structure.

Steel wire inside gives the pipes their shape and permits them to stretch and tighten.

You can get a better understanding of the characteristics and range of uses for these chimneys by examining the image in this article.

Features of flexible chimneys

A flexible chimney has a hollow, rounded shape. In order to create such a pipe, sheet metal that has been spirally wound is joined using a lock seam.

The product’s structure is distinguished by the steel wire that is inserted in between the metal layers, giving the pipe its strength and flexibility. Although their cross-sectional sizes vary, pipes with a diameter of 110 to 300 mm are the most widely used.

The pipe is 65 centimeters long in each section, but it can be stretched to a maximum length of 3 meters with ease. You can install a chimney with multiple bends and turns if you are flexible. The range of wall thickness is 0.25 to 1 mm.

Corrugated pipe can be used to install the full chimney channel or to arrange a portion of the chimney, such as the passage through the wall or floor or the brick indirect design chimney reconstruction.

Kindly take note! Installing a corrugated chimney is advised for heating systems that use a variety of fuels and produce hot or cold flue gases.

The following characteristics guarantee reliability:

• cylindrical spiral shape with a locking joint;
• reinforcing layer in the form of wire, making the body more resistant to mechanical breakage, but retaining the flexibility and elasticity of the product.

The design of corrugated products

Coated stainless steel chimney pipe is constructed from multiple layers of foil. Its strips, which range in thickness from 0.1 to 2 mm, are attached to a stainless steel spring using a unique locking mechanism. The pipe can be stretched to more than three times its original length and bent between 120 and 180 degrees thanks to this design. It is possible to repeat the stretching/compression process multiple times without the pipe’s integrity being compromised. The choice of larger or smaller diameter corrugated pipe depends on the boiler’s or stove’s capacity.

Stainless steel corrugations for chimneys are made in a range of diameters so you can select the size that fits the heater’s outlet pipe.

The chimney is treated on the inside as well as the outside with a special solution to extend its operational life. This kind of manipulation shields the channel’s content from aggressive media and chemically active substances. Metal corrugated pipe for chimneys has a minimum 20-year service life.

Insulation is necessary for the installation of corrugated flue ducts. Rolls of basalt wool are used as an insulator for these kinds of pipes. It works well for installations both inside and outside. Corrugated stainless steel pipe that is insulated from the outside does not heat up.

Main characteristics of corrugated pipes

The cross-section of corrugated stainless steel is circular when used for chimneys. In many situations, its standard length enables you to obtain a smoke exhaust channel without needless joints.

Kindly take note! The number of joints used during assembly directly affects how tight the chimney pipe is; the fewer joints, the better. The primary component used in the construction of corrugated chimneys is stainless steel. Because of its strength, resistance to corrosion, and heat resistance, it lengthens the lifespan of products. Many chimneys made of different materials become inoperable when condensate containing a certain amount of sulfuric acid (H2SO4) forms inside the channel during the boiler or furnace’s firing. As a result, this kind of pipe is utilized more frequently than others.

The stainless steel pipe’s design compensates for the initial size of the pipe’s linear expansion when exposed to vibrations and temperature, increasing the mechanical strength of the entire channel by up to 50%.

The possibility that the pipes will take on various shapes and configurations is important to consider when selecting the type for the chimney. A channel with numerous bends can be installed and repaired using corrugated pipe. It is essential to inspect corrugated pipe for bends or mechanical damage before purchasing it to ensure smooth installation.

Technical parameters of stainless steel corrugated pipe

Important technical indicators for stainless steel pipes with corrugation include:

• operating temperature: -50 °C – +110 °C;
• pressure at an operating temperature value of +110°C: 15 bar;
• possible bending radius of the product depending on the pipe diameter: 25-150 mm;
• coefficient of thermal conductivity: 17 W/(m*K);
• linear expansion: 17;
• roughness coefficient: 0.008.

Pressure variations cannot be withstood by corrugated pipe (limit value 50 atm). There is 210 atm of maximum pressure on destruction. The table includes additional pipe indicators.

Types of flexible pipes for chimney ducts

These products come in a variety of forms on the contemporary corrugated pipe market. However, not all of them are suitable for use with chimneys and fulfill safety standards. Constructions made of stainless steel and aluminum are not the same.

Only stainless steel pipe and accessories can be used to construct a safe chimney for a stove or fireplace.

Aluminum pipes were once used for gas heating appliances and column chimneys. This multi-layer corrugated pipe is a 10-to 15-centimeter laminated foil tube. Its affordability and robustness define it. A steel wire is inserted inside to provide the required shape.

The aluminum pipe is 650 mm long when compressed and up to 3 meters long when stretched. The ducting can be extended with metal duct tape.

Be mindful! Aluminum pipes are not meant to be installed in solid fuel boilers or fireplaces because they cannot tolerate high temperatures.

At this time, using such corrugations is not advised at all.

Although stainless steel corrugated pipes have superior qualities, they are structurally similar to aluminum pipes. The substance is capable of withstanding temperatures as high as 900 °C without endangering the channel’s structural integrity, and it can also efficiently eliminate combustion products from appliances that use liquid, solid, or other fuels (such as boilers, fireplaces, and stoves).

Single-wall pipes

Stainless steel sheet with a thickness of 0.6 to 2 mm is used to create single-layer systems. Although the variation is inexpensive, there is a limited range of applications for this type of pipe.

Only warm rooms are suitable for its installation, and the chimney’s exterior needs to be insulated. This is because there is a greater production of condensate when heated metal comes into contact with cold air. This shortens the stove’s or boiler’s service life, lowers the heating unit’s efficiency, and causes excessive fuel consumption.

The most common method for updating brick chimney ducts is to arrange a sleeve using steel single-wall pipes.

By shielding the brick chimney from damaging condensation, cladding increases its lifespan and lowers maintenance requirements by preventing soot buildup on the walls.

Manufacturers provide round and oval cross-section single-layer stainless steel pipes in various sizes, so you can select the ideal one for your specific brick chimney.

In a complex with a water heating system, a single-layer chimney can also be used for a small room, such as a garage, workshop, or bathroom washing room.

In this instance, the supply and return pipes are connected to a water jacket that is installed on the chimney pipe.

It is also possible to use the heat energy from the flue gases to heat a small space by building a single-layer chimney at an angle along a long wall.

Fire safety regulations must be strictly followed when installing a chimney made of a single-layer stainless steel pipe, including how nodes of passage through the floor and roof are arranged. Wooden structures may catch fire as a result of soot burning in the chimney, particularly when a solid fuel stove is being used.

Sandwich-systems

Two-layer pipe is available in straight and shaped elements to assemble a chimney of any configuration. It is a sandwich made of a non-combustible thermal insulator between metal shells made of stainless steel. This chimney type is the most practical because of the thermal insulation layer because:

• increased safety is ensured (the outer walls of the system are not heated to dangerous temperatures, the heat insulator itself is resistant to ignition);
• allows you to install the chimney outside the building;
• A minimum of condensation is formed (the inner pipe, through which the combustion products move, is not in contact with cold air);
• there is no unnecessary heat loss, which allows the heating unit to work in an optimal mode, without overconsumption of fuel;
• the system can be installed quickly and without the hassle of insulating the chimney.

Assortment of modules

Installing a stainless steel chimney is simple and can be done by oneself because it uses prefabricated modules of different kinds. Producers provide the subsequent components:

• Straight pipes. The part can be from 33 to 100 cm in length. Strong connection between the elements is made by means of socket mating, installation does not require the use of additional fasteners.
• 45° bends. They are used when it is necessary to perform deviation from the vertical line.
• 90° bends. They are used for transition between vertical and horizontal sections of the structure.
• 45° or 87° tee. Designed for installation of condensate collection unit, can also be used to connect two heating units to a common chimney.
• Condensate collector. It is installed at the lower point of the main vertical channel, into it the moisture condensed during cooling of flue gases flows.
• Revision element. Installed in places where there is a higher risk of soot accumulation, for checking and cleaning the chimney system.
• Passageways. Special elements for the arrangement of the nodes of the pipe passage through the floor and roof, help to ensure fire insulation of structures, tightness of the roof, attractive appearance.
• Hood, spark arrestor and other elements for mounting on the top of the chimney. Protect the system from the penetration of precipitation, the occurrence of the back draft effect, from sparks on the roof covering.

Choice of material

Various grades of steel are used in the production of stainless steel chimney pipes. The product’s resistance to burnout in the event that soot burns in the pipe is determined by the choice made. Remember to consider how often the chimney is used; boiler units’ chimneys, which must operate continuously during the heating season, have greater requirements than sauna stove pipes, which only occasionally receive heat.

Steel grade	Characteristics
439	Titanium and aluminum are used as additives. The material is resistant to acid corrosion, withstands heating up to 850 °С.
430	Predominantly used for the manufacture of housings and other elements that are not directly exposed to high temperatures and aggressive media.
409	High heat and acid resistance, can be used for chimney pipes of solid fuel stoves and fireplaces.
304	High strength, good weldability. Serves as a cheaper analog of steel 316, slightly inferior to its parameters due to the low number of alloying additives.
310S	Universal material due to its ability to withstand heating up to 1000 °С.
316	Thermal and chemical resistance is ensured by the addition of molybdenum and nickel. The material is suitable for boiler chimneys of any type.
316i, 321	Pipes are versatile, ductile, corrosion resistant. Can be used for wood stoves.

Chimney design

The first steps in setting up a flue gas discharge system are choosing a modular system and getting a project ready. Since gas boiler chimney requirements are more stringent, their project needs to be submitted to technical supervision in order to receive approval for installation.

1. The minimum allowable total height of the chimney is 5 meters, otherwise the draught will be insufficient.
2. Maximum length of the horizontal section of the duct – 1 meter;
3. Outside the building and in unheated rooms, the chimney must be thermally insulated, unless it is a sandwich system.
4. The height of the chimney flue cut-off above the roof:
5. at least 50 cm if the roof is flat or the distance from the ridge of a pitched roof to the pipe is less than 150 cm;
6. flush with the ridge or higher if the pipe to the ridge is 150 to 300 cm;
7. below the line with a slope of 10° from the ridge horizon, if the distance between the ridge and the chimney is more than 300 cm;
8. above the level of structures attached to the building.
9. If the roofing material is not resistant to fire, the regulations require the installation of a spark arrestor.
10. Between a single-wall stainless steel pipe and floor and roof structures, the minimum distance is 1 meter, (for a sandwich – 20 cm) the pipe must be insulated with non-combustible material (basalt wool).
11. A gap of 13 cm between the pipe and the roof (including non-combustible materials) is required.
12. Pipe joints must not be located inside structures (floors, walls). Minimum distance from the joint to the structure – 70 cm.
13. Horizontal and inclined sections of the chimney must be assembled "smoke-by-smoke" – the next element is placed on the previous one, so that combustion products are removed as efficiently as possible. The vertical channel is installed "condensate-wise" – to allow moisture to flow freely, the next element is inserted into the one below it.
14. Throughout the entire length of the chimney channel, its inner diameter should not be less than the diameter of the outlet pipe of the heating unit.
15. It is allowed no more than three turns along the entire length of the chimney.

Positive and negative points

The guidelines listed below. will enable you to become acquainted with the advantages and disadvantages of such installations:

1. Products are characterized by a high degree of flexibility and elasticity. Installation can be performed in any conditions, and the structure itself can be installed at any inclination and angle. Thus, it is possible to easily bypass all floors, beams and other elements of the house structure;
2. Simple and short installation. In order to install such a device, there is no need to use and buy various additional fittings and connecting elements (angles, adapters and bends);
3. Installation can be carried out on both sides of the building;
4. If necessary, several pipes can be easily converted into a single chimney. This is possible even for elements with different cross-sections (an adapter is additionally purchased);
5. Installation is done with your own hands, as simple fittings are used as connecting elements;
6. They are used to repair old and faulty chimney systems made of brick (dismantling of the old structure is not carried out);
7. The price is justified due to such parameters as durability and strength.

Any diameter can be chosen at your discretion.

Almost any angle can be used to position the corrugated system.

Corrugated systems are able to be installed at nearly any angle.

Connecting a hood can be done with aluminum pipes.

Pros and cons of corrugation

Any chimney system can use corrugated pipe, even at extremely high flue gas temperatures.

The simplicity of connecting two sections to one another is another benefit of corrugated pipe.

It exhibits opposition to:

• humidity;
• high temperatures;
• chemically aggressive environments.

This kind of pipe is utilized in ventilation and air conditioning systems in addition to chimneys. Because of its adaptability, the chimney can be installed easily even in the presence of intricate architectural features like built-in columns, floor beams, and sloping ceilings. The cost and labor intensity of the installation work are decreased by the chimney’s stainless steel corrugation feature.

It’s crucial to know that installation doesn’t require pricey parts (adapters, bends, or angles) if funds are tight. One benefit is that pipes with varying diameters can be connected within a single structure. For this, specialized adapters are utilized.

The brief service life of corrugated pipes and the requirement for insulation to prevent condensation are their main drawbacks. Moreover, corrugation has a much lower draught than smooth pipe, so it is not advised to use such a product’s vertical channel all the way through.

The boiler spigot’s diameter and the installed pipe’s size must match.

Advantages of corrugated pipes

There are numerous benefits to heating with corrugated stainless steel pipe:

– simplicity of installation because of elasticity and flexibility;

– it can be used at any angle, which is crucial for heating because there are more difficult-to-reach areas in these situations;

– simple installation because no extra building supplies, like angles and various adapters, are needed;

– Both indoor and outdoor installations are appropriate for corrugated stainless steel pipe;

Disadvantages of stainless steel pipes

Any material will have drawbacks in addition to its benefits. Stainless steel pipe that is corrugated is no different.

It is imperative to provide additional insulation to chimneys using corrugated pipes with thin walls. This is to make sure there isn’t any excess moisture or condensation inside.

It is also important to note that the service life will not be very long, meaning that you will eventually need to replace the pipes.

Production technology

Two primary components are used in the manufacturing of these pipes: stainless steel springs and steel foil. Stainless steel foil is wound in strips on the spring and joined to one another with the use of special coupling system. This contributes to the corrugated pipe’s flexibility. The pipe is 180 degrees out of shape, and it can be extended considerably—up to three times its original length, or three meters.

You can purchase pipes in any size in today’s construction market, which makes connecting it to the boiler very convenient. A laser is used to inspect every seam. In order to prolong the life of corrugated stainless steel pipe, it is coated with a unique solution that shields it from environmental factors and compounds found in combustion products. Such a chimney may have a twenty-year service life before the pipe needs to be changed.

How to choose the size of the corrugation for the hood

In order to guarantee that the air in every room of the house is replaced, consider the fan’s capacity first when designing a hood. The recommended size of the duct cross-section is indicated on the device’s passport.

The equality of the two air volumes flowing through the ventilation duct is its fundamental idea. Thus, duct narrowing is not permitted in single duct systems. This causes the fan motor to become overloaded and uses more energy.

There are two options available when selecting pipes based on material: either the same pipe but made of aluminum, or a 120 mm hood corrugated in plastic. By clearing the sediment from the walls of the duct, the first option facilitates easier maintenance. The second has a more sophisticated installation in terms of technology. 150 millimeter corrugated exhaust pipe is typically utilized as the main duct in branched systems.

How to connect the corrugation with the hood

In residential apartment buildings, the task is reduced to connecting the room’s internal ductwork to the exhaust ventilation system, which is anticipated in the project. How is the kitchen hood’s corrugation installed?

Ideally, the work is reduced to the following steps when the kitchen set has a hood installed in one of the cabinets:

1. Check the presence of a draft in the hood. To do this, a piece of thin (newspaper or toilet paper) paper should be brought to the air intake grille. If it is attracted to it, the draught is normal and you can continue to work.
2. Before attaching the corrugation to the hood, it is necessary to install a wall spigot with a neck of the required size on the grille of the ventilation system. For this purpose, there are 4-6 holes for screws on the rim adjacent to the wall. It is necessary to make a marking and drill the required number of holes in the wall. Install plastic inserts (dowels) in them and fasten the throat.
3. How to put the corrugation on the hood? One end of the pipe should be put on the neck and secured using a clamp. At the same time it is necessary to dent the wall of the product and securely tighten the screw. It should be remembered that in the process of operation, the exhaust pipe vibrates, so the connection must be strong enough.

1. Carefully, without compressing the pipe walls, stretch the pipe to the required length.
2. Make bends in accordance with the path of the pipe, lead it into the opening of the cabinet and fix the other end of the pipe to the neck of the fan using the same clamp. Flexible material can be laid along any trajectory, bypassing obstacles in the path of the pipeline.

Stretching the pipe in multiple steps is preferable to letting it sag in some places. During installation, if the tube is not stretched to its full length, it can be compressed along its length to conform to the installation site.

The horizontal portion of a stretch or suspended ceiling may be concealed by these fixtures. If the duct is constructed without causing any noticeable dents or other damage to the pipe, it appears to be in good visual condition.

This isn’t always feasible due to the product’s low mechanical strength. As a result, a lot of extractor hood users close the hood inside boxes that are arranged specifically. This is particularly true if the appliance resembles a hinged umbrella and the hood is not built-in.

Selecting the execution strategy is required prior to concealing the corrugation from the kitchen cooker hood. It might just be a box that is wall-mounted. If you were to ask what you could use to conceal the corrugation from the kitchen hood, you could provide a variety of box options. This article goes into great detail on how to build a box by hand.

The box is constructed from readily available sheet materials, including plastic, chipboard, plywood, drywall, and other comparable goods. In this instance, during operation, the front wall is opened for upkeep and repairs.

Making the box separately and hanging it on the wall is the second way to conceal the corrugation from the kitchen hood.

Installing the corrugation on the hood in the kitchen yourself

The exhaust pipe installation method shown above demonstrates how simple it is to complete the task with your hands. You will require a tool for work:

1. Marker for marking the position of the holes when installing a wall-mounted hood.
2. Electric drill with drills corresponding to the material of the wall (brick, concrete or other building stones) if the work is carried out in a wooden house, drills and drill are not needed at all.
3. Screwdriver for installing fasteners. Since it is not much, a screwdriver of the appropriate profile may be sufficient.

Rules of installation of corrugated pipes

As is already evident, this kind of pipe is a great way to address a lot of issues. It is important to note that specific brackets, which typically come in a set with the pipe, are required to attach the chimney to the house’s structural elements.

When it comes to reproducing the connection between two pipes, metal tape will be a more accurate method. Since it is completely hermetically sealed, combustion products cannot pass through. Since the product is lightweight, it can be mounted on any kind of structure. It won’t require a lot of work, and the load will be low.

Carrying out repair work

These pipes can be used as a building material for repairs as well as for the initial construction of ventilation and drainage systems. To begin with, this only pertains to brick-built chimneys. Given that this material is most prone to breaking quickly and becoming tense. Such a pipe is very hard to disassemble. Restoring it is considerably simpler when corrugated elements are used. In order to accomplish this, steel connecting elements are placed inside the brick box and connected to the house’s installed heating system.

Benefits of this approach:

• Rapid heating of the structure, significantly reduces the amount of condensate formed, which can lead to the destruction of the surface (brick);
• Due to the smoothness of the inner walls of steel pipes, they do not accumulate a large amount of soot and soot;
• Brick structures quickly deteriorate, due to which leaky areas and gaps begin to appear. Steel chimneys do not have this problem, as their tightness is not broken.

Parts with thin walls need to be insulated.

Installation instructions

Installing a chimney is essentially the same as installing a device of a similar nature that is composed of stainless steel pipes. However, there are some things to keep in mind:

1. There is no need to think about the selection of the diameter of the chimney – the corrugated spigot must correspond to the size of the outlet of the boiler.
2. With its thin wall, the corrugation loses a large amount of heat from the flue gases. Therefore, the chimney must be insulated along its entire length (except for the outlet pipe).

1. It is not allowed to narrow the chimney channel, its size should be stable along its entire length.
2. Only special adapters should be used during the installation process. The use of other products for jointing is fraught with loss of tightness, which is the main requirement for the chimney.
3. The use of corrugation provides for the mandatory installation of a condensate collector, otherwise its rapid planting is inevitable.
4. When connecting individual parts of the chimney, in addition to clamps it is necessary to install additional seals. Good results are obtained with the use of high-temperature sealant.

By following these guidelines, you can install a chimney pipe that is both high-quality and, most importantly, completely safe.

Installation of stainless steel corrugated pipe

Corrugated pipe is used for brick chimney repair (sleeving) and device adapters that connect the device’s outlet pipe to the chimney’s main channel. They can be put in from the outside or the inside.

Stainless steel corrugated chimney pipe is fixed using unique metal brackets. They can be realized as a separate retaining element or as part of the set to the pipe. Conventional clamps, which are tightened with a wrench, provide fixation.

Be mindful! Corrugated pipe installation requires that horizontal sections not sag.

During installation, no more than three turns of the corrugated chimney are allowed. For jointing of two pipes is used metal tape, which provides a high tightness of the docking unit and prevents leakage of combustion products. Installation does not require the use of sealant to seal the joints of the chimney elements.

Though its service life is shorter, corrugated stainless steel pipe can be a good substitute for rigid flue ducts.

Tips and recommendations

1. It is undesirable to use aluminum corrugated pipe for chimneys of solid fuel boilers. Yes, and for gas appliances, including the column, it is better to avoid the risk and use fire-resistant stainless steel. Gas corrugation is fire hazardous.
2. If the corrugated pipe is released outside through the chimney made of brick, the assembly is made from above. In this case, a strong rope is tied at the lower end. In this way, working with two people, you can quickly and easily corrugate the chimney with the corrugation. Flexible stainless steel chimney is fed through the mouth of the pipe, and the second participant in the process pulls up the corrugation from below.
3. When installing an external (wall) chimney is not allowed more than two of its bends. If necessary, it is better to perform them at an angle of 45 degrees.
4. When installing a steel corrugation for the boiler in the old chimney it is necessary to carefully cover the furnace with a wet cloth and close all technological holes in it. This is necessary to prevent soot from entering the living space of the house.
5. Before installing the pipe in the old chimney, it is necessary to thoroughly clean it from soot deposits on the walls.

The chimney is essential to maintaining a safe and comfortable home because it provides adequate ventilation. Due to their many benefits, corrugated chimney liners are a preferred option among homeowners who want to improve their chimney systems.

The longevity and heat resistance of corrugated chimney liners are two of their main advantages. These liners, which are made of premium materials like aluminum or stainless steel, are resistant to the extreme heat and corrosive combustion byproducts, guaranteeing long-term functionality and safety.

When compared to traditional masonry chimney construction, corrugated chimney liners are relatively easy to install. Corrugated liners can be easily manipulated due to their flexibility, which makes them appropriate for a range of chimney lengths and configurations. This flexibility lowers labor costs and possible disruptions to your home by streamlining the installation process.

In comparison to older, deteriorating chimney systems, corrugated chimney liners offer better insulation qualities in addition to being durable and simple to install. Maintaining ideal temperatures inside the chimney through proper insulation reduces the risk of creosote buildup and chimney fires while improving draft and combustion efficiency.

But, there are disadvantages to corrugated chimney liners to take into account, just like with any home remodeling choice. Corrugated liners may need periodic maintenance and inspection to ensure they remain in good condition, even though they are typically less expensive and simpler to install than traditional masonry chimneys.

To sum up, corrugated chimney liners provide a useful and affordable way to improve the effectiveness and safety of the chimney system in your house. Corrugated liners provide homeowners peace of mind knowing that their chimney is well-equipped to handle the demands of regular use because of their durability, simplicity of installation, and improved insulation qualities. You can take advantage of a dependable and effective chimney system for many years to come by being aware of the benefits and drawbacks of corrugated chimney liners and by following the right installation techniques.

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