The organization of effective heating in a garage box is a task faced by every car owner who wants to comfortably spend time repairing or maintaining a car in the cold season. The key element of any solid fuel or liquid heating system is garage-pipeThe quality and correctness of the installation of which depends not only on the efficiency of the device, but also on your safety. The wrong choice of diameter or material can lead to smoke, the formation of dangerous condensation or even fire.
Many craftsmen make the mistake of believing that any metal pipe found in the farm is suitable for the garage. However, heatThe thrust and durability of the structure directly depend on engineering calculations. In this article, we will take a closer look at what sizes are needed for different types of stoves, how to avoid soot accumulation and why. minimum temperature of flue gases at the outlet should not fall below 140 degrees Celsius to prevent the loss of acid condensate.
Choosing the optimal chimney configuration requires considering many factors, from the type of fuel used to the design of the garage roof. A well-designed smoke removal system will ensure rapid heating of the room and minimal consumption of firewood or waste oil.
Safety requirements and material selection
The garage is an object of increased fire danger due to the presence of flammable liquids, oils and the car itself. Therefore chimney It must comply with strict fire safety standards. The main requirement is that the material must withstand extremely high temperatures without deformation and burning. Most often used black steel with a thickness of 3 mm or stainless-steel AISI 304/316, which is more resistant to corrosion and aggressive environment.
It is important to note that the inner surface of the pipe should be as smooth as possible. Roughness and uneven welded seams inside the channel contribute to rapid fouling sootThis will reduce the swelling and the swelling. For garage ovens running on used oil, this is a critical parameter, since such fuels give more soda.
If you use sandwich designs, make sure the inner contour is made of heat-resistant steel. The outer casing may be of galvanizing, but its task is only thermal insulation and protection from burns when touched.
⚠️ Attention: It is strictly forbidden to use asbestos-cement pipes as the inner contour of the chimney for garage stoves. When heated above 300°C, this material can burst, and in case of fire it will not withstand high temperatures, which will lead to instantaneous spread of fire.
During installation, special attention is paid to the places where the pipe passes through the construction structures. The distance to combustible materials should be strictly regulated. For metal pipes without insulation, this distance is not less than 500 mm, and for insulated pipes - not less than 380 mm. Failure to comply with these standards turns the garage into a powder keg.
Calculation of chimney diameter and height
The diameter of the pipe is not an arbitrary figure, but the result of a calculation depending on the power of the furnace and the volume of the furnace chamber. Too narrow channel will create excessive resistance, the smoke will not have time to go out, and the stove will start to smoke into the room. Too wide a channel will cause hot gases to cool quickly, thrust will weaken, and condensation will form.
There is a rule of thumb: per 1 kW of furnace power, approximately 8 cm2 of chimney cross section is required. However, for garage bourgeois and furnaces, standard diameters are often used at work. The most common sizes are from 100 to 150 mm. For furnaces of the type "Bulerian" or complex pyrolysis structures, the calculation is carried out individually according to passport data.
The height of the pipe also plays a crucial role. The minimum height to ensure natural traction is usually 5 meters from the grate to the head. If the pipe goes through the wall, the horizontal section should not exceed 1 meter, otherwise the thrust will not be enough to remove combustion products.
Design features: vertical and horizontal installation
There are two main schemes for the output of the chimney in the garage: through the roof and through the wall. Vertical installation through the roof is considered more efficient in terms of aerodynamics and fire safety. In this case, the pipe goes all the way inside the room, giving the maximum heat to the air, and comes out already cooled.
Horizontal output through the wall (the so-called "American" method) is easier to install, as it does not require violation of the integrity of the roof and the organization of complex nodes of the passage. However, in this case, the horizontal section of the pipe up to 1 meter in length should have a slope towards the furnace (about 3-5 cm per linear meter) so that the condensate flows back into the fuel tank or a special collection, and not into the room.
When horizontally passing through the wall, it is critically important to properly decorate the passage assembly. The wall must be protected by non-combustible material and the gap between the pipe and the structure is filled. basaltic. The use of mounting foam or wooden inserts is unacceptable here.
Why should the horizontal area be short?
The long horizontal area quickly cools down. Smoke gases lose temperature, thrust drops, and combustion products begin to flow back into the garage. In addition, soot accumulates faster in horizontal areas.
If you choose the option with exit through the wall, the outer vertical part of the pipe should be securely fixed to the facade with clamps every 1.5-2 meters so that the wind load does not shake the structure.
Required tools and materials
For high-quality installation of the chimney with your own hands, you will need to prepare not only pipes, but also a specific set of tools and components. The absence of even one element can make assembly impossible or unsafe.
☑️ List of required materials
You will need to cut pipes and metal. Bulgarian (USM) with metal discs, an electric drill for drilling holes under the clamps and fastenings. If the pipes are thick-walled, a welding machine may be required, although modern systems are often assembled on flange or socket joints.
It is necessary to have a heat-resistant sealant that can withstand temperatures up to 1000-1200 ° C. Ordinary silicone sealants will burn at the first furnace. You will also need a deflector (head) to protect against precipitation and improve traction, as well as a condensate collector with a drain crane.
| Element of the system | Appointment | Materials of execution |
|---|---|---|
| Straight pipe. | Main smoke-removal channel | Black Steel 3mm / Stainless steel |
| Knee (retract) | Change of direction of pipe | Heat-resistant steel |
| Tee-toe | Installation of condensate scooper | Stainless steel |
| Deflector | Protection from wind and precipitation | Stainless steel / Zincov |
All elements must be selected taking into account the same diameter. The use of adapters with strong narrowing or expansion disrupts the aerodynamics of the flow.
Step-by-step instructions for assembly and sealing
Installation of the chimney begins from the heat source - the furnace. The assembly is carried out "by condensation" or "by smoke". The inner circuit (if it is a sandwich) or a single wall pipe inside the room is collected "condensate": the upper pipe is inserted inside the lower one so that the draining moisture does not fall on the outer surface of the joint.
Each compound must be thoroughly smeared with a heat-resistant sealant. After assembly and drying of the sealant (usually 24 hours), the system must be smoldered in a gentle mode to polymerize the composition. This will prevent the entry of carbon monoxide (CO) into the room through the microslits.
When assembling pipes into a socket, use rivets or screws on metal at the joint site to fix the pipes from turning and accidentally disconnecting during cleaning.
The outer part of the pipe passing through unheated space (attic or outside the building) requires mandatory thermal insulation. For this purpose, a basalt insulation with a thickness of at least 50 mm is used. This will keep the temperature of the gases and prevent the formation of ice jams in winter.
Chimney maintenance and cleaning
Regular maintenance is the key to safe operation of the garage oven. The frequency of cleaning depends on the type of fuel: when burning wood of solid rocks (birch, oak), cleaning is carried out 1-2 times a year, when using waste oil or coal - monthly or even more often.
The main method of cleaning is mechanical. Used ruffle on a flexible cable, the diameter of which corresponds to the diameter of the pipe. Before cleaning, it is necessary to close the furnace so that soot does not wake up in the room, and carefully remove deposits from top to bottom.
Chemical methods (burning of special logs-cleaners) are effective only as a prevention and will not replace mechanical cleaning of a thick layer of sodium. Ignoring cleaning leads to a blockage of the channel and the risk of back traction.
Regular cleaning of the chimney not only improves traction, but also reduces the risk of soot burning inside the pipe, the burning temperature of which can reach 1000 ° C.
It is also important to check the integrity of welds and joints before each heating season. The appearance of rust on the outside of the pipe can signal burnout from the inside.
How often should I change the stove pipe in the garage?
The service life depends on the material. Black steel with a thickness of 3 mm when used actively (every day) lasts 3-5 years. AISI 316 stainless steel can last 10-15 years or more. When corrosion spots appear, the pipe must be replaced immediately.
Can a corrugated chimney be used?
Use of corrugated pipe (siphon) as the main chimney for solid fuel furnace is prohibited. Corrugated creates vortices, quickly clogged with soot and burn out. Only a flexible insert is allowed to connect to a brick channel, and then from a special heat-resistant corrugated corrugated.
What to do if the pipe is very humming when the oven is working?
Hoodling (aerodynamic noise) occurs due to excessive thrust or swirls in places of narrowing. It is necessary to install a slate (latch) to adjust the thrust or check whether the pipe is too high for this power of the furnace.
Do I need a gastrointestinal tube in the garage?
Yes, if the roof of the garage or neighboring buildings is made of combustible materials (bitumen, ruberoid, wood). The sparkler is a mesh cap that prevents the flight of large red-hot particles.