We make a coaxial chimney in steps: Instruction + Video

We make a coaxial chimney in steps: Instruction + Video The quality of life in a country house directly depends on how effective the heating system is installed. In order for the flame to burn properly, it needs a constant flow of air, thereby reducing the amount of oxygen in the air inside the house.

Opening windows leads to drafts and is not always appropriate, especially during the winter months. In addition, for all types of boilers, a high-quality device is needed to remove smoke into the environment. Classic chimneys, which have a number of disadvantages, are gradually fading into the background, and a coaxial chimney comes in their place.

What is this design, what are its advantages, how and from what to make a coaxial chimney with your own hands - you will find answers to these and other questions below.

What is a coaxial chimney

A coaxial chimney is a structure in which one long metal pipe is mounted into another, shorter, but with a large diameter, such in such a way that inside they do not touch, but are connected by a special jumper.

The principle of operation of such a scheme is quite simple. The thin inner tube is made of high quality stainless steel. Through it, harmful substances are removed outside the premises.

The task of the outer tube is to provide oxygen to the flame. In fact, a coaxial chimney performs two functions simultaneously: the removal of combustion products and supply ventilation.

Types of coaxial flues

Regarding how the combustion products will be discharged, sideways through the wall, or through the ceiling, chimneys are divided into horizontal and vertical.

Vertical coaxial chimney is used only in the private sector. It is considered more environmentally friendly, but has a higher cost, since more material is required for its installation.

A horizontal coaxial chimney conducts flue gases straight horizontally through the load-bearing wall. This chimney can be connected to boiler equipment installed in a city apartment.


The horizontal movement of the system is possible if the room has forced ventilation.

Installing a coaxial chimney with your own hands

Materials and tools that will be needed for installation

  • - the pipes themselves;
  • - adapter for connecting the chimney with the boiler;
  • We make a coaxial chimney in steps: Instruction + Video - tees and elbows;
  • - crimping clamps for fixing parts;
  • - hammer drill with nozzles for wood or concrete:
  • - screwdriver;
  • - heat-resistant sealant.

Installation requirements

  1. - Lay the horizontal section of the chimney through the wall at an angle of 3 degrees.

    This contributes to the free drainage of moisture from the walls of the air channel;

  2. - the smoke channel should not exceed more than 5 meters in length;
  3. - the minimum distance to the nearest building is not less than 6 meters;
  4. - the outer part of the chimney protrudes at least 20 cm in length. Otherwise, in winter, icing of the air channel may occur;
  5. - if gusty winds are frequent where you live, it is additionally necessary to mount a damper on the outer part of the chimney.


If you want to install a coaxial chimney in a wooden house, be sure to glue the surface where the chimney is in contact with the wall or ceiling with a non-combustible material.

How to mount a coaxial chimney with your own hands

Installation and correct connection of the chimney to the boiler is a simple job that you can do yourself. Most importantly, follow the instructions step by step.


Carefully check that all items are included before starting the installation process.

Do not start work if any parts are missing.

  1. Determine the location of the outlet of the smoke channel, mark it on the wall. It should be no closer than half a meter from the window opening so that the outgoing combustion products do not come back.
  2. Take a hammer drill with a special cutting bit and drill a hole of the required size, which should exceed the diameter of the outer pipe by 20 mm, so you will also need to lay an insulating gasket.

  3. We make a coaxial chimney in steps: Instruction + Video We connect the adapter to the boiler outlet at the outlet. using a sealing gasket. Then take the screws and screw the adapter flange onto the boiler surface.
  4. We connect the pipe to the outer branch pipe of the adapter.
  5. Carefully check that all fasteners are well fixed and all connections are tight.

    If everything is in order, place the pipe in the prepared hole.

  6. Fix the boiler in place. Install the chimney, tilting it about 3-5 degrees towards the street.
  7. Seal openings between wall and outer casing with polyurethane sealant.

The coaxial chimney is a very useful and practical device that, when properly installed, significantly increases the efficiency of heating equipment.

A well-assembled chimney does not need to be constantly repaired, and it does an excellent job with its main function - the removal of combustion products into the environment.