Hood for a private house from a sewer pipe

The ventilation option from sewer pipes in a private house is characterized by low cost and ease of installation. You can assemble such a system yourself. It is affordable and effective. This option has both advantages and disadvantages.

Possibility of using sewer pipes for ventilation

The use of sewer pipes for ventilation requires some modifications - insulation

Sewer pipes differ in strength, degree of safety for the environment and human health. First of all, you need to choose the right components of the future system. PVC pipes are predominantly used. The tightness of the pipeline is ensured by rubber seals. Installation is simple, no special tools are required. Elements are inserted into each other. Due to the variety of fittings, a ventilation system of any configuration can be assembled from sewer pipes.

Some experts believe that only a hood can be mounted from such elements. Sewer pipes are not suitable for the supply air duct, because plastic releases toxic substances into the air. However, the products are accompanied by safety certificates, therefore, it is impossible to unequivocally assert a significant concentration of these substances in the air when using drain pipes as ventilation.

The inner surface of air ducts accumulates static electricity, so dust and dirt particles adhere to it. If treated with an antistatic agent, this can be prevented. In any case, all of the above does not exclude the possibility of installing a ventilation system.

To enhance air exchange, you can install a fan in the pipe

The following features of natural ventilation from plastic pipes are noted:

  • Air inflow is carried out through open doors and windows, vents, ventilation valves, slots due to the difference in pressure and temperature levels.
  • The part of the ventilation duct, which is located in cold rooms, for example in the attic, as well as on the roof, must be insulated so that condensation does not form.
  • If you install a fan on the hood, the quality and intensity of air exchange will improve.
  • Exhaust openings are placed in rooms where unpleasant odors are formed: in the kitchen, in the toilet, in the bathroom.
  • The outlet of the ventilation duct to the street is protected from precipitation and wind - a deflector is installed.

Extraction from sewer pipes is best suited for wooden houses.

Material for making pipes

Pipe elements for a sewage device differ in characteristics depending on the material of manufacture.

Pvc

PVC is resistant to UV light, therefore it is used more often

Durable and durable material resistant to UV rays and corrosive environments. The inner surface is smooth. The cost of PVC products is affordable, therefore, pipes made of this material are most often used for the installation of ventilation. The disadvantages include: low melting point (deformed at 70 degrees), fragility in frost, release of toxic substances during combustion.

Polypropylene

Polypropylene pipes have the smoothest inner surface, are resistant to aggressive environmental influences and chemicals, are durable, affordable, withstand high temperatures (up to + 120 ° C). With the same wall thickness, polypropylene elements are stiffer than those made from PVC.

Polyethylene

The material is not resistant to high temperatures, like PVC. Deforms at + 60 ° C, but withstands severe frosts. Polyethylene is chemically inert, environmentally friendly, has excellent noise insulation properties, its service life is about 100 years. Modern polyethylene pipes for sewerage are connected in a socket way. Due to the flexibility of the material, the pipeline can be installed with a bend.

Parameters and standards

For ventilation, a pipe with a diameter of 110 mm is most often taken.

When installing ventilation, in some cases, you will have to face a mismatch in the diameters of the holes, ventilation equipment and sewer pipes. The problem could be solved with the help of adapters, but those are not provided:

  • standard sizes of air ducts, ventilation parts - 200, 150, 125, 100 mm;
  • standard sizes of sewer pipes and fittings for them are 200, 160, 110 mm.

In view of these inconsistencies, only a natural ventilation system can be assembled completely from the drain pipes. It will not be possible to mount a forced system only from sewer pipes.

When choosing the cross-section of the duct, you need to take into account the norms of natural air exchange. Indicators are calculated in several ways. According to the calculation of the area, for every 1 m² there should be 3 m³ / h of fresh air. Determining the norm by the number of permanently residing people, they consider 60 m³ / h per person, for a room with an area of ​​more than 30 m² the norm is 30 m³ / h per resident. Moreover, for a kitchen equipped with an electric stove, the norm is 110 m³ / h, and for a kitchen with a gas stove - 140 m³ / h.

Installation rules and do-it-yourself manufacturing

Ventilation pipes are installed in the walls during the construction phase

Installation of ventilation from sewer pipes is carried out in accordance with a pre-developed plan. When composing a project, you must take into account the rules:

  • The rate of air exchange is determined by the number of sharp turns and bends. The system should be designed so that the ventilation duct is as flat as possible.
  • The shorter the duct, the more efficient the ventilation.
  • The difference between the lower and upper levels of the system must be at least 5 m, otherwise there will be no thrust. The problem can only be solved by installing fans.

For the manufacture of ventilation in a private house with your own hands, sewer pipes with a diameter of 160 mm are suitable. The volume of air exchange is 30 m3 / h, provided the height of the ventilation duct is 3 m. The throughput capacity is increased by increasing the section of the ventilation duct.

The preparatory stage includes the development of the project in accordance with the installation rules and the implementation of calculations. According to the standards for the frequency of air exchange, a complete change of air in residential premises should occur once an hour. If we are talking about a bathroom, kitchen or toilet - 3 times per hour. The values ​​for each room summarize and find the required system performance. It is necessary to determine the location of the air ducts by understanding the direction of movement of the air flows. The exhaust duct leads to the attic or to a common ventilation shaft located in the center of the building.

In this step, it is decided whether mechanical ventilation equipment will be used.

The diameter of the elements and the height of the installation are selected. If there are several exhaust openings, the capacity is divided by their number. The dimensions are transferred to the diagram.

Next, the number of components of the system is calculated and the shape of the fittings is determined, an estimate is made.In it, it is imperative to take into account the nodes of the passage through the walls, ceiling.

Polymer pipes must be insulated after installation

After purchasing pipes, fittings, fasteners (clamps, brackets, metal tape), ventilation grilles, equipment (if provided by the project), you can proceed with the installation:

  1. Brackets are being installed according to the plan.
  2. The main riser is being assembled.
  3. Exhaust air ducts are installed for each room.
  4. Individual branches are connected to the riser.
  5. Electrical equipment and ventilation grilles are being installed.
  6. Sheathing with insulation is carried out.

Sealing the joint is a desirable but optional step.

Advantages and disadvantages of sewer pipes for ventilation

Any configuration of the ventilation duct can be assembled from plastic

The construction of ventilation from plastic elements is not prohibited. But funnel pipes differ from standard air ducts in some features.

Among the advantages are:

  • low cost - a plastic sewer pipe made of PVC or PP costs several times less than a tin box;
  • easy installation - pipes are inserted into each other, their installation does not require special tools;
  • a smooth surface has a beneficial effect on the air flow rate;
  • electrical insulating properties - plastic does not conduct electric current;
  • structural rigidity - the structure keeps its shape, so you can save on fasteners;
  • low noise - plastic absorbs sound vibrations;
  • low weight - makes it possible to place it behind the ceiling structure;
  • resistance to biological and chemical attack - plastic is not affected by chemicals, for example, household use, corrosion. Spores of mold and fungi do not multiply on its surface.

There are also disadvantages compared to metal products:

  • restrictions on the air flow temperature - the air temperature should be no higher than 60 ° C;
  • low resistance to mechanical damage - plastic is fragile, it can be damaged by a blow with a sharp object;
  • Do not expose to heat - in this regard, it is not recommended to place the system in direct sunlight, near heat sources.

Ventilation from sewer pipes as a method of arranging a system is popular due to the low cost of consumables and ease of installation. Leaning towards this option, it should be borne in mind that it is difficult to disguise ventilation from waste pipes, but in terms of technical characteristics, air ducts from specialized elements and from sewer pipes are similar.

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  1. valery

    Don't fool people. Ventilation ducts in accordance with industrial safety standards are made only of non-combustible materials, because are one of the ways of spreading a fire in a building.

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