Fan tube: requirements, installation and repair. Fan riser, valve and ventilation

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A pipe in a private house
  • Application of
  • Is it always necessary to have a fan riser?
  • Assembly requirements
  • Use of
  • fan valves Design principles for fan ventilation
  • Recommendations for the installation of
  • pipes Frequent installation errors
  • Repair

When building a private house, you need to take into account a number of nuances that you would never have considered if you decided to settle in a cityapartment. In large, multi-apartment buildings, engineering networks are laid on the shoulders of construction companies and you do not need to know how it all works. However, as soon as you dare to get out of the city's bustle and start building your own home, you will see a lot of problems related, first of all, with the arrangement of ventilation, sewerage and water supply systems. In the functioning of the last two systems, a big role is played by the tube pipe. Today's conversation will be about her.

Bathroom in a private house

Application

A pipe or a standing riser

is a pipe that connects the sewer stand to the atmosphere. It goes to the roof of the building and serves to equalize the pressure in the sewage system.

Conclusion of the ventilation system on the roof

When a large volume of water is drained into the sewer system, the system is discharged and without air intake, which is provided by the fan pipe, the smelly smell will penetrate directly into the house. Protection of unpleasant odors is a hydraulic seal, which is formed in the bend of the sewer pipe. The fan tube regulates the normal operation of the water trap, which can "fall off" under pressure. Thus, the fan pipe is an integral part of the ventilation and drainage systems of a residential house.

Air valve in the fan pipe

Do you always need a fan riser?

If we still could not convince you of the need to install a fan riser, you can do without it, but for this you have to observe two important conditions. First, the house should not be higher than two floors, and secondly, the house should not have more than one toilet and one sink. However, if these requirements are quite satisfactory to you, this does not mean that you can safely start designing a sewage system without a fan pipe, without worrying about the appearance of unpleasant odors. It is necessary to take into account several other important factors.

The chimneys under the roof

So, a pipe is needed if:

  • sewer pipe is less than 0.5 cm in diameter;
  • you use an autonomous sewer system;
  • in the house, or on its territory there is an artificial reservoir or other device, the maintenance of which involves the periodic drainage of large volumes of water into the sewer, for example, a pool.
House with pool

Installation requirements

The mounting of the pipe pipes must be carried out taking into account two main requirements:

  • the diameters of the pipe and the riser must match up to a millimeter;
  • the place where the tube will go out should be carefully thought out. Vent pipes are usually vented to the roof;it is important to take into account the direction of the air flows so that the sewage evaporation evaporates in the opposite direction from the balconies, windows and apartment houses.
Location of the riser and the chimney in the house

Using the

You probably heard that the contents of sewer pipes can enter the apartment through the toilet. Usually this happens in cases when serious mistakes were made in the design of the sewerage system, for example, the angle of inclination of the pipe was incorrectly maintained. The reason may be a strong blockage, caused by the ingress of large debris, mice or rats into the sewer. If you do not want to one day witness how your toilet bowl feces out of itself, you should take care of this in advance, even at the stage of installation of the chimney.

Valve for fan pipe

Reverse fan valve is designed specifically to prevent the return of sewage to plumbing. Usually it is installed outside or inside a fan riser. It acts as follows: when you release the water, the valve cover opens and lets it pass and everything it blows, and then, tightly closed, under the pressure of the steel spring.

Installed check valve

When installing such a valve, it is necessary to take into account the fact that its lid should open against the movement of water. Only in this case it will reliably block sewage streams moving in the opposite direction.

Principles of designing fan ventilation

You can design fan ventilation yourself. For this, it is necessary to have at least a minimum knowledge of engineering systems and to study the requirements of SNiP.

The main pipe in the bathroom
Design scheme of the chimney in the house
Cast-iron pipe in a private house

In a generalized form, the principles of designing a fan pipe system are as follows:

  • the slope of horizontal pipes in the direction of the sewage gas movement should be at least two hundredths of a percent;
  • one fan riser can be used to combine several sewer;
  • to change the direction of the fan tubes is possible only if the change is carried out above the place where the last equipment supplied to the riser is located;
  • for connecting several pipes use a fan tee;Mount it should be at a 135 or 45-degree angle in the direction of the movement of gases;
  • to change the direction of fan ventilation is possible only with the help of a tap and at a 135-degree angle.
  • it is necessary to take into account the distance from the fan pipe to the balconies and windows: in the horizontal plane it must be at least 4 meters;
  • the pipe must be separate from the ventilation and chimney;
  • the lower part of the fan pipe should be in a warmer room, and the upper one - in a cooler one;in this case, the thrust will be stronger.

Recommendations for the installation of pipes

After the preparation of the project, you can proceed directly to installing the fan riser. To begin with, purchase all necessary equipment. You will need: fan and connecting pipes, ventilation duct and fittings. Installation of the fan ventilation system should be carried out in several stages.

  • Preparatory work. Perhaps your house already has an old sewer system. If they are made of cast iron, it is better to dismantle them and replace them with more modern ones. Before starting work, make sure that the riser is blocked.
  • Installation of a fan riser starts from the foundation of the house. In the supporting wall, make holes and, using metal clips, fix the fan tube on it.
  • If the plumbing is already installed, connect the toilet bowl to the fan riser using a tap tap. Seal the connection with ring gaskets.
  • For soundproofing of the structure, use a mounting foam or mineral wool.
Laying of new pipes in the bathroom
Wiring for a toilet and bidet in a private house

Take a look at the following video on installing the fan riser.

Frequent installation errors

Guided by good intentions, many seek to build their own fan ventilation systems in the hope that this will only improve its performance. However, most often such changes in the project lead to very disastrous consequences. Consider the most common mistakes:

  • Arrange the output of the pipe in the attic, not on the roof. If the sewage gases do not leave immediately into the atmosphere, sooner or later they will accumulate under the roof and gradually begin to penetrate into the living quarters.
  • Installation of a fan pipe from the inside of the bearing wall. If the fan riser passes from the outside, there will be problems associated with the formation of condensate.
  • Replacement of the protective fungus on the top of the pipe with a flipper or a decorative weather vane. Despite the more aesthetic appearance, the traction from this does not become stronger, but, on the contrary, it decreases, resulting in unpleasant odors spreading throughout the house.

Repair

Repair of the pipe pipes, as a rule, reduces to the replacement of old cast iron pipes with new plastic pipes. Do it better under the guidance of an experienced plumber, calling for help a couple of assistants. Cast iron - the material is extremely heavy, and at the same time, fragile, so it should be handled with care. Be extremely cautious, as there is always the possibility of damaging your own health or the entire sewage system. In addition, if you are replacing a fan pipe in a multi-storey house and, at the same time, living on one of the lower floors, ask the experts if your new plastic pipes will withstand this pressure of the system.

FANS AND Sewer pipes

For work you will need a heavy sledge hammer, a bulgarian, a drill and any other tool you deem it necessary to use, because dismantling of cast-iron pipes is not an easy task. Having dismantled the old pipes, you can start installing new ones. How to do it, we described in detail in the previous sections. We hope that our instructions will help you to install a new fan ventilation system without any problems!

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