Do I need to bring the sewer pipe to the roof. Fan pipe for sewerage

Using a well-maintained toilet in a country private house is always more convenient than "conveniences in the yard."

However, in order for the smell from the pipes and the septic tank not to penetrate into the rooms, you will have to take care of the ventilation of the sewer system.

Ventilation of sewer risers is provided by a system of plumbing devices that pass liquids and air from the bathroom to the sewer and block the return flow of gases and air into the room.

Imagine that the sewer system of the house is equipped in the simplest way: all toilets, sinks, bathtubs and bidets are connected to the septic tank through pipes through a common riser. How does such a system work?

When flushing from the toilet, feces enter the riser, and then into the septic tank. The septic tank is not hermetic, so the air displaced by feces is released into the atmosphere on the street, and unpleasantly smelling gases are reliably cut off by water in the water seal.

However, this happens only if the volume of the washed-off liquid is small and does not fill the entire lumen of the riser.

If the volume of liquid is large (for example, when water is released from baths simultaneously on two or three floors), a piston is formed in the riser from the liquid, which descends.

As with any piston pump, this will cause a rarefaction of air above the piston and suction of water from all plumbing fixtures into the riser and then into the septic tank.

After such a drain, polluted air with an unpleasant odor freely penetrates through all plumbing fixtures into all bathrooms at once.

This effect is most pronounced when the contents of the septic tank are quickly pumped into the sewage truck.

Unpleasant smell in the house is not limited. During the decomposition of feces in a septic tank, gases dangerous to humans are formed: hydrogen sulfide and methane.

Thus, the ventilation of sewer risers must constantly remove gases from the system into the atmosphere and reliably block their penetration into the room when draining and pumping out the contents of the septic tank.

Elements of the ventilation system

The sewer ventilation system includes three elements:

water seal;
air valve;
fan pipe.

- this is a device in the form of a U-shaped pipe or channel, constantly filled with water and blocking the access of gases from the sewer system to the premises.

The siphon works on the principle of communicating vessels: when the liquid is drained through one vessel, the second vessel overflows and drains into the riser.

After the drain is completed, the siphon remains filled with liquid and reliably blocks access to gases from the septic tank.

The water seal prevents the appearance of an unpleasant odor in the rooms under the following conditions:

constant filling with liquid;
the absence of decomposing organic residues in the plumbing fixture and in the siphon itself;
the gas pressure in the riser must be equal to the air pressure in the rooms.

To comply with the first two conditions, it is enough to keep all wastewater receivers clean and periodically fill their siphons with clean water if they are not used for a long time. Pressure equality is provided by other elements of the system.

- This is a device that allows air to enter the sewer riser and blocks the flow of gases from the riser into the premises.

In small one- or two-story private houses with bathrooms on the ground floor, discharging a large amount of waste into a septic tank is rare. In these cases, an aeration valve is quite capable of preventing gases from entering the premises.

Install it at the upper end of each riser (usually in the attic). In this case, the ventilation pipe must be installed on a septic tank, which is easier and cheaper.

The valve system cannot replace siphons on plumbing fixtures, it only complements them. If the water in the siphons dries up, an unpleasant odor still appears.

This is a ventilation duct connected to the top of the sewer riser and led to the roof.

This element allows you to eliminate the unpleasant odor from the sewer in the most radical way.

The fan pipe in a private house performs two functions:

equalizes the pressure in the riser with atmospheric pressure when discharging a large amount of wastewater;
constantly removes the gases formed in the sewer system, preventing their accumulation and entry into the premises.

A properly calculated and installed sewer pipe on the roof almost completely eliminates the possibility of accumulation and penetration of sewer gases into the house.

Only if the siphons dry out does an unpleasant odor still appear, but it is much weaker due to constant ventilation. It is best to use modern plastic pipes that do not corrode for the installation of the ventilation duct.

How to install

There are two prerequisites for installing a ventilation pipe in the sewerage system of a private house:

the diameter of the risers does not exceed 50 mm;
the house has two or more floors and at the same time plumbing fixtures are installed on all these floors.

Since the installation of plumbing on the floors is planned in advance in the project of the house, a ventilation duct for sewerage must be provided in the same project.

The parameters and installation of the fan pipe are regulated by the Building Norms and Rules (SNiP 2.04.01-85 * "Internal water supply and sewerage of buildings").

The rules for installing a fan riser are simple.

The height to which the exhaust part of the riser is displayed depends on the design of the roof. It is:

if the roof is flat unexploited - 0.3 m;
if the roof is pitched - 0.5 m;
if the roof is operated (structures are placed on it) - 3 m;
if the channel is placed in a prefabricated ventilation shaft - 0.1 m from its edge.

The minimum distance from the exhaust part to windows and balconies is also limited. Horizontally, it must be at least 4 m.

Wind vanes are not installed above the exhaust part of the ventilation risers (clause 17.18 of SNiP), since in winter a large amount of hoarfrost from condensate is deposited on them, as a result of which the channel is blocked.

The deflector can only be installed if the house is built in an area with a warm climate.

Sewer ventilation is brought to the roof separately from any other. The channel can be laid inside the prefabricated ventilation shaft, but it should not intersect with room ventilation or a chimney (clause 17.19 of SNiP).

The diameter of the outlet pipe must be the same as the diameter of the riser. As a rule, the exhaust part and the riser consist of the same elements.

If there are several risers, they can be brought into one common exhaust part of the same diameter. In this case, the pipelines connecting the exhaust part must be installed with a slope of 0.01 (1 cm lowering per 1 m of length) towards the sewer risers (clause 17.20 of SNiP).

Any conscientious architect, when developing a house project, provides for the correct outlet of the fan pipe. However, after construction, many owners rebuild private houses, changing the layout. In this case, problems may arise with the correct withdrawal of sewer ventilation.

If the roof is pitched, it is most reasonable to bring out the exhaust part at the top of the slope in the same way as they do with a chimney. However, the toilet after redevelopment may be in a completely different place. Is it possible to move the sewer hood with it?

The output of the fan pipe at the bottom of the roof slope or even under the roof overhang does not make sense: in winter, snow falling from the roof can damage it. In this case, the sewer ventilation pipe is led out under the roof to its upper part, and only then the fan pipe is installed.

In this case, the entire ventilation duct must be insulated so that condensate does not freeze in it.

If the exhaust part is slightly offset relative to the riser, they can be connected with a corrugated plastic sleeve. As a last resort, the outlet of the ventilation sewer risers can be made at the top of a blank wall in the backyard.

At the same time, the pipe must be brought out through an opening in the wall at a distance of 30–40 cm. If it is brought out into an opening closed with a decorative lattice, condensate in the cold season will settle over the hole and spoil the plaster.

Summary

It is not difficult to mount the ventilation of the sewer networks of a low-rise private house system yourself, subject to certain rules.

When installing plumbing fixtures only on the ground floor, there is no need to install a separate ventilation pipe for sewerage. In this case, the effect of the water piston can be eliminated by using an air valve installed at the upper end of the riser.

If plumbing fixtures in the house are installed on all floors, the uninterrupted functioning of plumbing is ensured by a properly installed fan pipe. Subject to the rules of SNiP, there are no problems with the operation of the sewer system.

Not everyone knows why to bring sewers to the roof. Meanwhile, it is precisely the lack of communication between sewer pipes and the atmosphere that can cause an unpleasant smell in the toilet.
To begin with, let's look at SNiP 2.04.01-85 * "Internal water supply and sewerage of buildings" says:

Paragraph 17.18 says the following:

Domestic and industrial sewer networks that discharge wastewater into the external sewer network must be ventilated through risers, the exhaust part of which is discharged through the roof or prefabricated ventilation shaft of the building to a height, m:
from a flat non-exploited roof .......... 0.3

pitched roof ....................................... 0.5

operating roof .............................. 3

trim of the prefabricated ventilation shaft ..... 0.1

Why is sewer ventilation necessary? In a nutshell, about the sewerage device itself in the house and about the water seal. In every plumbing fixture, whether it is a sink, sink, shower or toilet, there is a characteristic bend in the sewer pipe, a “knee”, in which water must always be.

It is this layer of water that prevents the penetration of odors from the sewer riser into the toilet or kitchen.
Now about the device of the sewerage system schematically:

Imagine that someone on the 3rd floor of the house flushed the toilet tank (5). A five-liter drop of water, well, or not quite water, flying through the sewer riser (2) creates a vacuum behind it. If there is a zone of rarefaction, then the air tends to it from all sides. And it’s good if there is that notorious exhaust ventilation or “fan” pipe (1). When creating a vacuum, air from the roof will quickly enter the pipe and the pressure will balance. Many builders, wanting to save on pipes and not wanting to make holes in the roof, simply put a plug on the sewer riser on the top floor. In this case, the air in the pipe has nowhere to come from, and this very drop, from the third floor, flying past the second, sucks in water from the hydraulic locks. This is called "water seal failure". Shower cabins and ladders are especially susceptible to this phenomenon - in them the size of the water seal is minimal.
However, there is a way to do without a pipe on the roof. The outlet is a ventilation (vacuum) sewer valve.

When a vacuum occurs in the riser inside the valve, the shutter is folded, the valve instantly sucks in air and the shutter closes back, preventing odors from the sewer riser from entering the room. However, the sewer vacuum valve is not a very reliable device. It may fail or become clogged with dust. Thus, the most reliable way to vent the riser is to exit to the roof.
There are several requirements of regulatory documentation regarding the fan parts of the riser.
Exhaust parts of sewer risers should be located at a distance of at least 4 meters from windows and balconies. It is impossible to connect the fan parts of the sewer risers with ventilation systems or chimneys. It is possible to combine several sewer risers from above with one exhaust part, but its diameter cannot be less than the diameter of the riser itself. For most buildings, the diameter of the risers and, accordingly, the exhaust parts are pipes with a diameter of 110 mm. Combined exhaust parts must be laid with

When it comes to laying (or replacing) sewers, mistakes in planning or installation can lead to bad odors. To avoid this, good ventilation of the sewer riser is necessary.

This is done with a fan pipe.

What is a sewer pipe and how does this system work?

Fan pipe - section of pipe that connects a sewer system to the atmosphere(goes up through the roof). It branches off from the sewer riser and goes up through the whole house.

Upstairs (on the roof) it is covered with a fungus (head, umbrella) - so that precipitation and debris do not fall from above.

Drains pass through the sewer pipe from top to bottom. If you open the drain at one point (for example, drain the water in the toilet), then the water will pass through the system without any problems. If at the same time water is drained from several plumbing points (toilet, bathroom sink, bathtub, shower, washing machine), then the riser will be filled to its full diameter.

This will create a vacuum that will “drag” the water from the water seals, which will cause an unpleasant smell in the bathroom - if there is no fan pipe in the house.

If it is, then air will be sucked from the atmosphere through its hole, and the pressure in the system will equalize. Thanks to this, the plumbing fixtures remain in place and do not allow the smell to penetrate from the pipes into the room.

Another solution to the problem is . It can be installed instead of a fan pipe, or it can complement it.

More about the operation of the sewer system (video)

Why is it needed: purpose and functions

Now consider why such a scheme is needed:

Removal of gases that accumulate in the sewer system (they are removed through the pipe and released into the atmosphere).

Maintaining pressure in the sewer system (leveling at the time of draining a large amount of water).

"Protection" of water seals (prevention of their suction).

In general, the fan pipe ensures the normal operation of the sewer system.

Where is a fan pipe needed, and where can one do without it?

According to SNiP, in low-rise construction (in one-story and two-story private houses), the sewerage scheme does not have to have a fan pipe. The reason is that in such houses the volume of simultaneously drained drains is small, and in rare cases it can completely block the diameter of the sewer riser.

In a private house, there is a need for such a ventilation duct if:

the house has two or more residential floors, and on both (or more) floors there is a bath and a toilet;

the house will have 2 or more bathrooms that can be used simultaneously;

the house has a swimming pool (or any other source of a large number of drains, for example, a jacuzzi);

the diameter of the sewer riser is small (less than 100-110 mm);

Near the house there is a septic tank (cesspool).

If a house is being built on 1-2 floors, in which there will be 1 toilet bowl and a bathroom (sink, shower cabin) - you can do without a ventilated riser, or limit yourself to installing a sewer valve. This is true for cottages and small cottages.

Do I need a fan pipe in an apartment in a multi-storey building? Yes, it is needed, and always available. The reason is that in apartment buildings the volume of waste is always large (especially during the hours when people are in the apartment: in the evening, early morning, on weekends).

How to choose the right fan pipe?

Before you install a riser or change it to a new one, you must choose the right pipe. An error in selection can lead to incorrect operation of the system.

The main options for choosing are:

Length (you need to know what the full height of the line should be).

Material.

What should be the pipe diameter?

The diameter of the fan riser is the main characteristic that must be taken into account when choosing and designing a system (especially in Khrushchev, since there are a large number of drains in apartment buildings).

Basic rule for sizing: minimum diameter should not be less than the cross section of the sewer riser(if the riser has a diameter of 250 mm, then the fan pipe should have the same size).

Common sizes in the construction of one- and two-story cottages are pipes with a cross section of 50-90-100 mm. This is enough if the house has:

sewer riser with a diameter of 100 mm;

sink (sink in the kitchen) with a drain pipe of 50 mm;

soul drain;

washing machine.

Selection by material

For laying a sewer riser, pipes made of the following materials are usually used:

PVC. Plastic products are easier and faster to install, cheaper in cost. Gradually, plastic is replacing cast iron - new systems are usually made from this material.

Metal (cast iron). Cast iron pipe is an outdated solution for sewer systems. Cast iron is strong and durable, but it is much more difficult to work with it: cast iron products weigh a lot, they are more difficult to cut and join, during operation they get dirty faster.

If necessary (if the system or its individual sections are being repaired and replaced)you can connect plastic and cast iron pipes. Insertion into each other is carried out with the help of special adapters (cuff).

How to check if there is a fan pipe in the house?

If you are not building a house, but buying a finished building, it is advisable to find out if it has a fan riser.

To do this, you need to flush the toilet, and listen to the sounds from the sink or bathroom. If you hear a squelching sucking sound, the pipe is either missing altogether or clogged and needs to be cleaned.

Installation rules

To properly install the fan riser, the following requirements must be observed:

The output of the riser should not go to the attic, but to the street. If the gases from the sewer are released into the attic, there will be an unpleasant smell, and in addition, humidity will increase (which will lead to mold).

The diameter of the fan riser must be no less than the diameter of the sewer. More is acceptable, but not required.

The outlet of the pipe should not be near the wall or near other structures (windows, balconies). Otherwise, spots from gas emissions may appear on the wall, and an unpleasant smell will be felt in the rooms near the outlet.

The outlet must not go under the roof overhang, otherwise the pipe may be damaged in winter (due to ice or snow that has come down).

For private houses, it is enough to use 1 fan riser. Lines from all plumbing points should cut into it, using tees, crosses and adapters.

There must be a temperature difference between the lower and upper points of the pipelines (warm at the bottom, cold at the top).

The fan riser can be laid in the ventilation shaft, in one box. However, at the same time, it should not be connected to ventilation ducts leading to residential premises and chimneys (according to SNiP).

It is permissible to connect several sewer pipes to one fan riser.

Installation rules (video)

In Schema IDs

According to the "direction" of the output, 2 options for laying can be distinguished:

horizontal - whenthe pipe is not led out through the roof, but through the wall. The method is relatively rare, it can only be used in private construction, in cases where, for some reason, a conclusion cannot be made through the roof. In this case, a grill is installed on the hole, not a deflector.

AT vertically - the most common option: the riser is brought up through the roof.

Vertical passage, in turn, is divided into 3 subtypes:

Exit with a slope of 90 degrees: a branch is made from the riser at a right angle, from which another branch then goes, and already from it there is a straight section that goes above the roof.

An exit with a slope of 45 degrees: a branch is made from the riser at an angle of 45 degrees, another branch is made from it, and already from it there is a straight section extending above the roof.

Vertical exit: The riser simply continues to the exit above the roof.

The exit of the fan pipe through the roof: how is it done and what should be the height?

At the fan riser, located outside, above the roof, must meet certain requirements:

The height above the roofing material of the operated roof must be at least 3 meters.

The height above a flat unused roof must be at least 30 cm.

The height above the pitched roof must be at least 50 cm.

Horizontal lead spacingpipes and the nearest window (balcony) must be at least 4 meters.

From above, the output should cover the deflector. It is needed to prevent debris, insects, birds, precipitation from getting inside.

If it is possible to draw a line through the pediment, it is better to implement this option, and not go through the roof. In this way, you can save yourself from troublesome work with roofing material and further sealing.

How is the output through the roof? (video)

Mounting errors

Installation of a ventilation riser for a sewer system can be performed with errors. Of the most common:

Dismantling the riser (intentionally or unknowingly) in apartments (multi-storey buildings).

Conclusion under the roof overhang.

The use of pipes of different diameters when creating a sewer system.

Conclusion of the riser to the attic.

Mounting the riser on the outer wall of the building.

Do you need soundproofing of the fan pipe?

Soundproofing needed if the pipe passes through living rooms. In this case, the noise of water and air will be heard in the premises. The pipeline itself will also make noise - due to vibration and resonance.

Noise isolation of sections passing through non-residential premises is not required.If the riser is laid inwall, and the thickness of the partition is small - then at the stage of construction (repair) it is recommended to perform at least "light" soundproofing.

AT Ideally, the issue of sound insulation should be addressed at the design and construction stage of the building. The riser needs to be “hidden” in a separate box (shaft), or planned so that it does not pass through the living quarters.It is also recommended to use special "silent" pipes(thick-walled products made of polypropylene).

The process of soundproofingcarried out with the help of "shell" or rolled insulators, which are wound on the pipeline. The thicker the layer, the more effective the insulation will be.

Arrangement of ventilation of an independent or centralized sewage disposal system is impossible without the installation of a special fan outlet. The element blocks the return flow of gases to the bathrooms, acting as a connecting component between the septic tank and the atmosphere.

The installation technology of the riser is quite simple. But before you start work, you need to understand the principle of operation of the ventilation duct and understand how to properly install the fan pipe in the house. The answers to these questions are detailed in the article.

The fan pipe is a structural element that connects the pipeline to a specially erected ventilation duct. Its key purpose is to remove gases and odors distributed from the sewer.

The presence of a ventilation riser in the system guarantees the absence of unpleasant loud sounds in the living quarters that occur at the time of draining the water, and the “fragrances” of sewage sewage (+)

The length and shape of this element can be arbitrary. There are models of vertical and horizontal execution, beveled at a right or acute angle.

The principle of operation of the fan pipe is simple. Wastewater entering the vertical riser creates a vacuum in the cavity of the pipeline. It can be partially compensated by water, which acts as a hydraulic damper in the siphons of installed plumbing.

But if a vertically installed riser has a large length and at the same time at some point there is a one-time powerful discharge of the waste liquid, then a vacuum occurs in the sewer pipe.

The piston formed from the liquid, with all its strength and a characteristic “smacking” sound, at one moment breaks and breaks through the plumbing valves, emptying the siphons.

As a result, water is completely sucked out of all water seals. Therefore, there are no obstacles left. Due to this, they quickly spread throughout the building.

This effect is also manifested when the fecal pump quickly pumps out the contents of a cesspool or septic tank into the tank of a sewage machine

The trouble is that the appearance of an unpleasant "fragrance" in living rooms is not limited. The natural process of decomposition of feces is accompanied by the release of gases harmful to households: methane and hydrogen sulfide.

If the system is equipped with a fan riser, at the moment of “throw-in” there are no such consequences, since the vacuum created in the collector simply does not have time to break through the hydraulic dampers in the siphons.

This is prevented by atmospheric air flows, which, simultaneously with the occurrence of vacuum, are drawn into the system, blocking the penetration of gases into the room when draining and pumping out the septic tank.

Image Gallery

When installing a fan pipe with a cross section of 110 mm, the check valve is connected using an adapter.

One of the ways to install a check valve in the cavity of the vent pipe and then connect it to the sewer outlets of the system

An important point: all operations for the installation of a fan pipe should be carried out on dry surfaces. At the stage of fixing the check valve, you should not use silicone sealants and any kind of lubricant.

Typical installation errors

Most often, the situation with the formation of a vacuum in the system occurs when pipes of different diameters are used in its arrangement. For example: a toilet bowl is connected to a pipe D 110 mm, a bathtub is connected to a pipeline D 50 mm, and a drain tank hole is D 70 mm.

Unpleasant stench in bathrooms often appears when plumbing fixtures are equipped with siphons that have insufficient volume. This arises due to the fact that with irregular use of devices in the siphons, the remaining water dries up, removing the damper and opening free access to the spread of "flavors".

By correctly calculating the dimensions of the fan pipe and installing it in compliance with all installation rules, you can almost completely eliminate the possibility of accumulation and the likelihood of sewer gases entering the house. And then there will definitely be no problems with the operation of the sewer system.

Do you have practical skills in installing a ventilation fan pipe? Share your knowledge or ask questions on the topic - the contact block is located below.

The sewer system needs to communicate with the atmosphere for air inflow in the event of a rarefaction and removal of gases. For these purposes, a sewer pipe is installed in a private house. Its absence can lead to the fact that the system will not work correctly - draining the water will be accompanied by annoying sounds, and an unpleasant smell will appear in the room.

With intensive draining of water, the flow rate in the sewer system increases sharply, as a result of which a zone of rarefied pressure is formed. Since, according to the law of physics, the pressure in a closed system tends to equalize, water from the outlets and siphons rushes into the rarefaction zone, which causes unpleasant and rather loud rattling and squelching sounds in the kitchen and bathroom. Fan pipes for sewerage provide instant air flow into the rarefaction zone, thanks to which excludes the possibility of "sucking" of water from hydraulic seals.

Toilets are often cited as the main cause of rarefaction, but it should be remembered that the flow rate can also increase significantly when a washing machine is running, which drains water under pressure. If you answer the question why a sewer sewer pipe is needed, in one phrase, we can say that such structures prevent the common clearance of the sewer riser from being blocked by the drained flow.

Another function of the fan pipe is removal of gases formed in the sewer system. Otherwise, they can get into the room, causing a lot of trouble.

Pipe materials and diameters

Since the fan pipe in a private house is part of the system, it will be optimal to make it from the same material that is selected for the rest of the pipelines. In some cases, a combination of materials is allowed, but experts believe that the effectiveness of heterogeneous systems is significantly lower.

For the installation of the inside of the sewer in a private house, cast-iron or plastic pipes are used.

Cast iron pipes have the required durability, however, in the presence of defects in processing or mechanical damage, they become susceptible to corrosion. In addition, the large weight of the products greatly complicates the installation, not only in terms of increasing labor costs, but also in terms of fixing the vertical sections of the pipeline.
Increasingly, for the installation of internal sewer systems are used plastic pipes, which, in addition to low weight, have a number of other advantages, including strength, durability, absolute immunity to corrosion and the presence of a smooth inner surface that reduces the likelihood of deposits and blockages. Another advantage of plastic is a large selection of not only pipes of different diameters, but also the fittings necessary for the implementation of the developed scheme.

The choice of the diameter of the fan pipe is made taking into account the design features of the system. Main condition: the diameter of the vent pipe should not be less than the largest pipe(including pipes and outlets) systems.

Since in the vast majority of cases the largest sewer pipes are used to connect the toilet and have a diameter of 110 mm, the drain pipes are also installed with the same diameter.

Riser installation and roof outlet

The current building codes (SNiP 2.04.01-85 * "Internal water supply and sewerage of buildings") recognize the mandatory installation of a fan riser for houses with 2 or more floors, however, experts are sure that in a one-story private house such a design can significantly increase the degree comfort and avoid unnecessary hassle. Taking into account the purpose of the vent pipes, it becomes clear that their need directly depends on the degree of risk of blocking the flow of the sewer, and therefore on the amount of effluent entering the system. Thus, when using the house as a summer vacation spot with short stays and having a minimum amount of plumbing and drain points, you can completely do without a fan pipe.

For a full-fledged residential building, which has a toilet, a bathroom or a shower room, several taps, a washing machine and a dishwasher, a fan pipe is, if not mandatory, then, in any case, a very desirable addition to the sewer system.

The installation of a sewer pipe is not difficult. In fact, the fan part of the system consists of individual outlets for drain points and a fan riser. With a large area of \u200b\u200bthe house and several bathrooms or toilet rooms located at a considerable distance from each other, several fan risers can be installed in order to eliminate the laying of long horizontal pipelines in which the traction force is reduced. When connecting several outlets with one fan pipe, it is better to place the supply pipelines with a slight slope.

The temperature difference contributes to the intensive movement of gases through the pipe and their effective removal from the system - the initial section of communications is located in a heated room, and the final one is outside the house.

Since the main part of the fan pipe is a vertically located line, it is important to take care of its reliable fixation. Fan pipes are attached to the walls with the help of. In some cases, it is recommended to soundproofing of fan risers using materials specially designed for this purpose (for example, mineral wool rolled cloth or plates).

Special attention is required to bring the vent pipe to the roof. It can be carried out through a riser located inside the house or using a pipe fixed on the outer wall of the house. Optimal is the output of the fan riser exactly on the roof, since the exit to the attic is not allowed by existing norms and rules, and the installation of the structure under the overhang increases the risk of pipe destruction when ice or snow masses leave the roof.

In order for the system to work effectively, it is important to follow certain rules.

The height of the fan pipe above the surface of the pitched roof should be at least 0.5 m, above the unused flat roof - 0.3 m. And if the roof is used, then the height of the pipe must be at least 3 m.
If there are several pipes leading to the roof (general ventilation, a chimney from a fireplace or stove, etc.), the fan pipe must necessarily be higher than all the others. Otherwise, unpleasant odors can enter the room. For the same reason, it is strictly forbidden to combine a fan riser with a common ventilation system or with a chimney.
The distance from the windows to the vent pipe should not be less than 4 m.
It is preferable to carry out the exit of the fan pipe in the place where the maximum number of drain points is located, without transferring the pipe for aesthetic reasons.
It is not recommended to install decorations or other additional elements on the fan pipe. Their presence can contribute to the formation of condensate and, accordingly, icing and a decrease in the diameter of the passage. The removal of gases in this case will be less efficient.

To reveal the topic in as much detail as possible, it is described in another of our articles.

If you decide to make your own shower cabin, then it will be useful for you to install a shower drain under the tile.

check valve

Installing a non-return valve on the downpipe can improve the efficiency of the system, in particular, prevent the backflow of gases. In addition, non-return valves reduce the risk of clogging the drain pipe.

Sewerage without a fan pipe equipped with will perform its functions, however, its ease of use and degree of reliability may be lower, therefore, the combined use of these elements is still recommended. In particular, with dried water in the siphon, the valve alone will not be able to get rid of the smell.

Installation of a fan pipe is carried out at the stage of construction of the inner part of the sewer, it is quite possible to do it yourself with minimal skills. It is only important to strictly follow the recommendations of specialists and the requirements of building codes and regulations. The use of modern materials significantly reduces the complexity of work.