In any private home, it is simply necessary to equip a system responsible for high-quality ventilation of the premises. For the arrangement of these structures, fan elements are considered to be the most suitable, preventing the discharge of air in the ventilation system. Siphons, also used in the process of arranging ventilation, are small in size and have a small supply of water. But when the system is idle for a long time, the water from the siphon evaporates, which allows foreign odors to easily penetrate the home’s ventilation system.

The use of vent pipes allows you to avoid pressure drops within the system and ensures the system operates when there is insufficient or complete absence of water in the siphon. This problem is especially relevant for country houses, often used for temporary residence. A poor ventilation system that allows sewer odors to enter the home causes unpleasant odors inside the whole house.

Even if not used for a long time, the sewage system is capable of accumulating volatile gases, which rise through the ventilation ducts at the first opportunity. If there is insufficient liquid in the siphon, a warmer sewer air able to enter the premises.

Helpful information:

What are fan pipes made of?

Elements of sewer structures have not been made of asbestos, ceramics or cast iron for quite a long time. Modern material Plastic is considered to be inexpensive, lightweight and easy to install. Most often, PVC elements are used in combination with rubber seals to construct sealed sewer systems. It must be remembered that each type of pipe must be used taking into account subsequent operating conditions and operating temperatures. For connecting dishwashers and washing machines that use water with high temperature, it is necessary to use special pipes designed for these tasks.

But having examined this issue in more detail, we can come to the conclusion that this is practically impossible. Most often, the diameter of the pipe connected to the drain of the bathtub and toilet does not exceed 110 mm, and the diameter of the drain hole of the tank does not exceed 70 mm, the diameter of the siphon is set to no more than 50 mm. Other plumbing equipment used in modern house or apartment, designed for the use of small wastewater that does not greatly affect the overall situation.

If the task is to equip several bathrooms, the use of waste pipes is justified and necessary.

Fan pipes are used in the following situations:

• if the cottage is intended to install several toilets or bathtubs, placing them on different floors of the house;
• if the sewer risers have a cross-section of 50 mm;
• the general sewerage system includes pools that affect the total volume of sewerage;
• The site provides for the use of septic tanks that can cause unpleasant odors.

Installation Rules

When installing exhaust pipes, you should adhere to two basic rules:

1. The diameter of the exhaust pipe must be equal to or greater than the cross-section of the sewer outlet.
2. When positioning the final section of the hood, it is necessary to find a place with good influx fresh air.

When constructing fan pipes, the same methods and technologies are used as during the installation of risers. If you figure it out, exhaust system can be called the final element of the sewerage system, installed in a pre-designed ventilation duct.

Quite often, if not provided required amount exits for ventilation, you can install exhaust structures through the walls of the room. On the holes that appear after this on the outer part of the wall, you can install decorative elements, gratings.

Fan pipe for sewerage in a private house will help get rid of unpleasant odors even in rooms with a properly equipped hood and ventilation system.

Siphons used in sanitary equipment and drains are small in size and cannot hold a large volume of water. This leads to the fact that, if not used regularly, moisture can completely evaporate and open the way for air from the sewer system.

When installing vent pipes, there is a problem with the penetration of unpleasant odors from sewer system is almost completely solved; warm air from all sanitary appliances is released into the atmosphere without any problems.

Video - Features of installing a fan riser

If there are one or two sewer risers, waste pipes can easily be installed on the roof of a cottage or private house. With the increase in the number of risers, appearance the building will be damaged due to the large number of hoods on the roof.

If there are more than three sewer risers, it is possible to install one drain structure and equip the other risers with valves consisting of a spring and a rubber seal. This vacuum valve is designed to supply air into the pipeline when a discharged volume appears when draining water in the system. After equalizing the pressure, the valve is securely locked, preventing odors from entering the system.

There is an opinion that vacuum valves can successfully replace drain pipes. But if the site is supposed to accommodate treatment facilities, a sewer hood is simply necessary to remove sewer fumes.

Building codes and standards, based on theoretical calculations, the laws of physics and many years of experience in installing these systems, require the laying of exhaust communications and ventilation systems along the contour of heated areas. In this case, the final section should be located in the area where colder air masses are located.

Installation of vent pipes is not permitted in the attic. This is due to the fact that an unpleasant odor will constantly accumulate in the attic space, then penetrating into other rooms on the upper floors of the building.

Installing sewer hoods near the outer walls of a building can significantly spoil the appearance of the building. Evaporation from sewage moving upward can, after a relatively short amount of time, leave an unpleasant residue on the roof and upper elements of the house.

Tweet

Stammer

Like

A healthy microclimate in the house consists of several factors. It would be a mistake to think that it depends only on the presence or absence of air conditioning and a properly installed ventilation system. The most important component of the fresh atmosphere of a home is a properly installed exhaust pipe. It successfully copes with odors emerging from the sewer. The presence and normal functioning of the structure guarantees the absence of the “aroma” of sewage and loud unpleasant sounds in the house when draining water.

Operating principle of a fan pipe

This device is designed to provide ventilation to the waste system. It connects the structure of sewer pipes with the atmosphere or with a specially installed ventilation duct. The shape and length of the device can be arbitrary. You can find straight, bent at an angle, vertical and horizontal parts.

When installing a sewer system, most often a drain pipe is installed - a ventilated riser. The operation of the device prevents the smell of sewage from entering the apartment

The principle of operation of the fan pipe is quite simple. Wastewater discharged into a vertical riser creates a vacuum in the pipeline. It can be partially compensated for by water in the siphons of plumbing equipment. But with a powerful drain or a high riser height, the vacuum formed in sewer pipe, with a characteristic “slurping” sound, breaks the water seals of the equipment, draining the siphons. In this case, there are no obstacles to the smell from the sewer.

In systems equipped with a drain pipe, everything happens a little differently. The vacuum created in the sewer pipeline does not have time to “suck” water out of the siphons. This is prevented by atmospheric air, which begins to be sucked into the system simultaneously with the appearance of vacuum in it. Thus, the water seals in the plumbing equipment remain in place and successfully prevent unpleasant sewer odors from entering the apartment.

In what cases is it necessary to install ventilation?

According to the standards, a sewer pipe must be installed in the following cases:

• The building has more than two residential floors, each of which is equipped with a sewerage and water supply system.
• A one-story building is equipped with a swimming pool or has other devices that can produce one-time wastewater of a significant volume.
• The sewer risers in the building have a diameter of 50 mm.

Low-rise buildings are usually erected without installing ventilation. However, it must be taken into account that this is only advisable for small one-time flows. Determining their level is quite easy. Installation of the device will be considered necessary if the flow Wastewater can completely block the vertical riser.

The most common situation: the toilet is most often installed on a pipe with a diameter of 110 mm, the opening of the cistern has a cross-section of 70 mm and a pipeline with a diameter of 50 mm extends from the bathtub.

IN multi-storey buildings, where water supply and sewerage are supplied to each apartment, installation of a drain pipe is necessary. The riser is brought to the roof

It becomes clear that the simultaneous operation of one bath and one toilet will not create problems. Even if a dishwasher or washing machine and sink, they will not be able to seriously increase the volume of one-time drainage. Therefore, ventilation in this case is installed at will. But if the house has several bathrooms and toilet rooms, it becomes impossible to do without equipment.

Ventilation needs to be installed not only in engineering systems, but throughout the entire house. How to do this correctly, you will learn from our article:.

Features of installation

The installation of such a riser can be done independently. First of all, for this you will need to purchase suitable pipes. You need to understand that the structure is a direct continuation of the sewer pipeline, so the pipes from which the main system is assembled are quite suitable for it.

It should be ensured that the cross-section of the element being installed coincides with the sewer hole or is slightly larger. Practice shows that optimal diameter fan pipe – 110 mm.

To ensure the pressure and temperature differences necessary to create draft, it is recommended to choose a place in a heated room for the initial section of the riser. The final section, on the contrary, should be placed in a cold place. This should be an open place, then the draft created in the pipe will freely release unpleasant odors into the atmosphere. The actual installation of the device is extremely simple: the structure is installed in a pre-prepared ventilation duct.

There are two almost equivalent options for properly arranging a waste pipe: conclusion ventilation riser on the roof and installing a check valve

Check valve system

The equipment put into place can be equipped with a special system called. It allows normal operation without venting the ventilation riser to the roof. In addition, the device is necessary for:

• Correction of insufficient slope of a sewer pipe.
• Preventing mechanical impurities and rodents from entering the system.
• Obstacles to the return of wastewater to plumbing fixtures.

The check valve on the drain pipe must be installed without the use of all kinds of coatings and silicone. The surface must be clean and dry

Depending on the type of check valve, it can be installed outside or inside the element. The device is directed towards the movement of the drains; its elements, made in the form of petals, must be curved towards the plumbing fixture. Internal installation involves thorough cleaning and subsequent degreasing of the inner surface of the pipe where the insert will subsequently be installed. Experts strongly do not recommend using various lubricants during installation, including silicone ones designed specifically for sewage systems. All installation work is carried out only on dry surfaces.

Ventilation riser for sewerage

Traditionally, the upper part of the vent pipe is brought to the roof in the form of a ventilation riser. According to the recommendations of construction SNiPs, the height of the structure should be at least 0.5 m per pitched roof, 0.3 m - on a flat, unused surface and 3 m on a used roof. In this case, the minimum horizontal distance from the riser to the opening balconies or windows must be at least 4 m. Combine the outlet of the drain pipe with stove chimneys or ventilation is strictly prohibited.

If there are several sewer risers in the house, they can be connected by one exhaust part. In this case, the cross-section of the pipe chosen for its installation should be equal to or greater than the diameter of the risers themselves. For most buildings, the diameter of the single exhaust part will be 110 mm. The combined exhaust elements are laid with a slight slope, about 0.02%, directed towards the movement of gases.

It is strongly not recommended to place the device in the attic. It is also prohibited to install the exhaust pipe outlet directly under the roof overhang, since snow falling and sliding from the roof can easily damage it. All kinds of additional structures for the hood, such as weather vanes or deflectors installed at the outlet of the sewer riser, will not give the expected effect. On the contrary, according to experts, they provoke the appearance of condensation in the system, which can lead to blocking of the outlet openings if it freezes.

You will also find useful material about which pipes to choose for sewer ventilation, and what factors need to be taken into account when designing:

It is possible for sewerage to operate without ventilation. But will the owner of a home where such a system is installed agree to get used to the constant smell of sewage? Proper installation of a fan structure will easily solve an unpleasant problem, especially since you can do it yourself. After carefully reading the instructions, you can safely get down to business. As a result, the house will not only shine with cleanliness, but also smell like it.

9655 0 0

Should the sewer system “breathe”? Let's figure out why the sewer pipe is installed on the roof

I’m willing to bet that even if you paid attention to the roofs of modern two or three-story cottages, you were only surprised by the abundance of pipes removed, without even suspecting that among them there was also a sewer pipe. And if its purpose is a mystery to you, then you will probably want to know about its feasibility, and in general, for what purposes it is intended.

What it is

Of course, the website is not an encyclopedia, and you will probably want me to support my story with links to those regulating its purpose regulations. And this is quite understandable, because today construction marketers are selling so many unnecessary products and additional elements to ignorant buyers that a logical question involuntarily arises: is this sewer pipe one of them? Maybe you can do without it?

No, there's no way around it. This is really important and required element sewer system of any high-rise building. Essentially, the sewer drain pipe is not designed for water movement. Its purpose is to connect the sewer system with the surrounding atmosphere.

There are several reasons for this:

1. You know from your school physics course that draft occurs in any vertical pipe. As the pressure in its upper part increases, air penetrates into the living spaces through leaky connections, and, as you understand, it does not smell like flowers;

A water seal is not a panacea, since the sewerage system has vulnerabilities in the form of connections of the sewer comb (indoor sewer system) and the siphon elbow, the tightness of which is far from ideal.

1. Massive discharge of water, which is not uncommon in high-rise buildings, leads to the filling of the riser, as a result of which an air front with excess pressure is formed in front of the water flow. This phenomenon can be neutralized by inspecting the basement sewerage system (if this is a private house– then excess air escapes through sewer pipe septic tank);
2. At the same time, a vacuum is formed behind the downward moving mass of wastewater, the force of which is sufficient to suck out the water seals (from the toilet, from the elbow under the bathtub and sink). The residue is unable to retain air, and the rooms are filled with unpleasant odors.

Captain Obviousness suggests: it is possible to solve the described problems, both at the same time, with the help of a jumper between the atmosphere and the sewer system.
During a volley discharge of water, odors will escape through the sewer riser, and the water seals will remain intact.

Regulations

SNiP 2.04.01-85

This condition is realized through risers, in which the exhaust part must exit through the roof or through a ventilation shaft.

The height of the riser depends on the type of roof and is indicated in the table:

The permissible distance from the exhaust part of the riser to the balcony or nearest window is 4 meters.
Why the instructions require this is hardly necessary to explain.

SP 40-107-2003

Another set of requirements under the number SP 40-107-2003 stipulates the case of a drain pipe leaking on an existing roof. In particular, paragraph 4.8 states that the exhaust part of the riser must be equal to 3 meters. But at the same time, it is permissible to combine four or more risers within a technical floor.

It is worth noting that such a system works quite well.
But the slightest leak in any joint will lead to the fact that the owners of apartments on the upper floors will inhale “aromas”, since there is no escape from the draft created in the risers.
The narrowing at the top helps create excess pressure in them.

Installation highlights

Fan pipes still need to be installed correctly:

1. Underestimating the diameter of the exhaust part of the pipe is extremely undesirable. Diameter transitions from 110 to 50 mm reduce throughput 5 times. And it is quite expected that it will simply not be enough to compensate for the drop in pressure;

1. The horizontal part of the sewerage system must have a slope of 2 cm per linear meter . Its presence prevents the formation of air and water jams;
2. Removing sewer risers that open into the attic will not lead to anything good. And not only because of odors, high humidity will quickly saturate the thermal insulation with dampness, which in turn will lead to rotting rafter system(wooden or metal trusses);
3. When going to the roof fan boner it should be equipped with a deflector, thanks to which neither debris nor precipitation will get into the pipe. Among the advantages of the deflector, we also note increased traction in windy weather, which increases the efficiency of the entire system.

If after meeting regulatory requirements If you are still full of doubts as to whether you need sewer system ventilation or not, we offer simplified explanations:

• If you are designing a house, then know that the district architect will not approve your project without drain outlets if the future building has more than 2 floors;
• If the number of floors is 1-2 floors, then the number of toilets and bathrooms matters. A fan output is not needed if there is only 1 of them.

But that’s not all - even if your project includes only 2 floors with one bathroom and one bathroom, their location will play a role:

• A drain pipe is needed if the toilet is located at different levels;
• A connection to the roof is needed if a pipe with a diameter of less than 100 mm will be used to lay the sewer;
• A connection between the sewer system and the atmosphere is required if there is a swimming pool in the house;

• The presence of sealed treatment facilities will also require the installation of a waste pipe.

Unforeseen moments

Let's go back to apartment buildings, where in last years There is a negative trend - during sewer repairs, residents of the upper floors unknowingly (or perhaps deliberately) dismantle the sewer riser leading to the technical floor.

If you ask about the reason for such “innovation”, most of the answers will be typical - “who needs it?” But this intervention does not go unpunished - after a couple of weeks, a persistent and unpleasant odor appears in all the apartments above this sewer riser.

In such situation the best solution a sewer valve will be installed to replace the removed section of the system. This device is structurally a “block post” - allowing air only inside the pipe and not releasing it into the room.

Let's simulate a situation in which residents have installed a sewer valve:

• In normal mode, due to the resulting draft, excess pressure is formed in the upper part of the riser. It prevents moist and unpleasantly smelling air from the sewer from entering the room;
• The vacuum that occurs during a volley of sewer discharge activates the valve, through which air is sucked into the system and the pressure is equalized.

The vacuum valve I describe is not a 100% guarantee against odors.
This can only be achieved by completely sealing all connections.

Author's remarks

I allow myself the rights personal experience add some useful and practical tips to the standard recommendations:

1. My own house, which has 2 toilets and 2 baths located on different floors, was built without a drain. And at the same time, no odors were observed inside the room, since the simultaneous use of two or more outlet points is a rather rare event;

1. In the house of our friends, similar to my home, we designed and installed a vent outlet. At the same time, we were guided by the requirements of SNiP 2.04.01-85, in the part where the prevailing wind direction is described. It is not worth increasing the exhaust part of the riser by more than 4 meters, since it can freeze in winter;

The likelihood that the pipe will be heated by warm air rising from the house decreases with every extra centimeter of its length.
A couple of days of cold weather - and an ice plug will certainly form inside, and along with it, odors will appear in the apartment or house.

1. We did not install the fan outlet through the roof, but mounted it ourselves through the gable. A definite plus is the minimum amount of work required roofing material and subsequent sealing.

Conclusion

I hope that in this publication I was able not only to add to your construction glossary, but also to professionally explain how the sewage system functions in your home. And if you are a resident of the upper floors, then warn you about possible consequences unauthorized interference in its work.

As always, the video in this article will allow you to explore additional topic materials. Please feel free to leave your additions and comments. Good luck, comrades!

For the sewer system to function properly, it must communicate with the atmosphere. Owners of private housing who independently install the engineering systems of their home need to know what functions the sewer riser performs. Let's figure out what kind of device this is and how to install it correctly.

Many owners undertake to build the water supply and sewerage system of their home themselves. To do this, you must first study the theory. One of the mandatory elements of the system is the fan riser. Not everyone understands the purpose of this element and often underestimates its importance. Let's figure out what a fan riser is, why it is needed and how the installation proceeds.

Purpose

An integral element internal system drainage system connecting the wastewater disposal system to the atmosphere is a fan riser. The main function of the element is to equalize the pressure inside the system and maintain water seals in plumbing items.

Advice! A water seal is a flexible drain in the form of a loop, installed after the drain hole of plumbing items. At the bottom of the bend there is always water, which acts as a “plug” that prevents sewer gases from entering the room.

If there is no drain riser, then at the time of discharge of a large volume of wastewater (for example, when using a flush in the toilet) in the water seals of plumbing fixtures installed in the neighborhood, they can be torn off.

After this, unpleasant odors will appear in the bathroom or kitchen coming from the sewer system. Thus, this is a kind of ventilation for sewerage; it performs two functions at once:

• removal of sewer gases harmful to health into the atmosphere;
• maintaining normal atmospheric pressure inside the pipeline, preventing the occurrence of vacuum and removing water seals.

Is it always necessary?

During the construction of a drainage system individual house installation of a fan riser is not always necessary. So, during construction one-story house, equipped with a single bathroom, you can do without this element. But in the following cases you won’t be able to do without a fan riser:

• the house has more than one floor, each floor has a bathroom;
• the sewer riser has a diameter of 50 mm;
• an object that requires a large amount of water to service, for example, a swimming pool, is connected to the sewerage system;
• A sealed system is used with the installation of an underground septic tank.

Device

Let's figure out how to plan the design and installation of a fan riser. The installation should be planned at the stage of developing the internal sewerage scheme. It is desirable that the diagram be as simple as possible; it should have a minimum number of corners and bends.

The ideal position of the vent pipe is vertical, the pipe is discharged through the ceilings and roof. However, in practice, sometimes it is not possible to maintain a perfectly vertical shape; it is often necessary to attach additional elements.

For example, it is not always possible to connect all outlets from plumbing fixtures to one riser. Sometimes it is necessary to install an additional riser, which can be connected to a common waste pipe.

It is possible to install one vent pipe at an equal distance from two risers and connect them to this duct. This connection method allows you to evenly distribute the pressure in the system. One of the rules for creating a fan riser is correct selection diameter It must match the diameter of the main riser.

Advice! It is not allowed to combine the ventilation of the sewerage system with the chimney or ventilation system of the house.

Material selection

Since the sewer riser is a continuation of the sewer system, it makes sense to make it from the same material as the sewer riser itself. However, if necessary, it is also possible to use a combination of materials, although experts argue that the efficiency of such a heterogeneous system will be lower.

What types of pipes are used? In most cases, cast iron or plastic is used.

• Cast iron. This is a durable and strong option, but it has significant drawbacks. The most significant disadvantage is the significant weight of the structure, which significantly complicates their installation.
• Plastic. Nowadays, plastic pipes are used in most cases. They are lightweight, durable, strong, and are resistant to corrosion processes.

The choice of pipe diameter depends on the characteristics of the system. In most cases, in private houses, a pipe with a diameter of 110 mm is used to assemble the riser.

Installation features

The installation of a fan riser is not particularly difficult. Intensive removal of gases from the system is facilitated by temperature changes, since the initial section of the sewer system is located in a heated room, and the drain pipe is located on the street.

The main part of the fan riser is a vertical section; care must be taken to securely fix the pipe. It is attached to the walls using metal clamps. The most difficult moment is removing the element through the roof.

Exiting the pipe into the attic is unacceptable, and placing the outlet under the roof overhang is irrational, since the structure may be damaged when snow falls from the roof. For the system to work effectively, the following rules must be observed:

• sections of the sewerage pipeline laid horizontally must be located at a slope of 0.02% towards the riser;
• it is prohibited to change the direction of the riser above the level of connection of the extreme outlet from the plumbing equipment;
• when connecting some pipeline branches, it is necessary to use bends with an inclination angle of 135 and 45 degrees;
• The height of the pipe above the roof depends on the roof structure. If this is an unused flat roof, then the height should be at least 30 cm. On a pitched roof, the pipe should rise half a meter or higher. If the fan riser is discharged through the operated flat roof, then you will need to use a pipe with a height of at least three meters;

• if several pipes are installed on the roof (chimney, ventilation, etc.), then you need to ensure that the vent riser is higher than all the others. Otherwise, unpleasant odors may enter the house;
• the outlet of the waste pipe should be located away from the windows, the minimum distance is 4 meters;
• You should not install visors or other decorations on the fan riser. These parts will interfere with the movement of air, in addition, this will contribute to the accumulation of condensation, which will lead to the formation of a layer of ice and a decrease in the diameter of the passage. To prevent birds or debris from entering the system, simply tighten top part pipes with grating.

Insulation and sound insulation

Let's figure out whether it is necessary to insulate the fan pipe and use sound insulation. Riser passing through Living spaces, thermal insulation does not make sense. But the part that runs through the cold attic and above the roof must be insulated. Otherwise, ice will form inside in the cold.

But sound insulation, on the contrary, is necessary in residential premises. Previously, no one thought about sound insulation of fan pipes, since the sound insulation properties of cast iron are much better than those of plastic.

Nowadays, when cast iron elements of the sewerage system are practically not used, it is worth using sound insulation to increase the comfort of living. IN plastic pipes Various types of noise arise:

• Shock. Noise occurs when water flows hit the walls of pipes.
• Atmospheric. Sounds are created by air flows entering the system.
• Resonant. Noise occurs when the sewerage pipeline interacts with the walls, floors and other structures of the building.
• Vibrating. This type of sound occurs if the pipe comes into contact with any operating equipment (most often, pumps).

High-quality sound insulation can be achieved if you start building engineering systems at the house design stage. Then the installation of risers is carried out in specially created shafts, which will restrain the spread of sounds.

In the event that the pipe is laid openly through living quarters, sound insulation is carried out by wrapping it with foamed polyethylene material in two or three layers.

Alternative

In a small private house, you don’t have to install a drain pipe; its function will be performed by a vacuum valve. Let's figure out what kind of device this is and how it can be installed. The functions of the vacuum valve are the same as those of the drain pipe, that is, it prevents vacuum from occurring in the pipe and makes it impossible for unpleasant odors to enter the house.

Installing a vacuum valve in a private home is a complete replacement for a drain pipe, and its installation will cost much less.

Advice! It is important to distinguish between the functions of a check valve and a vacuum valve. They differ both in execution and purpose. The check valve prevents the reverse flow of liquid, and the vacuum valve ensures pressure balance.

The vacuum valve operates due to the difference in pressure inside the system and outside. When a vacuum occurs, the valve opens and allows air to flow into the system. After equalizing the pressure in the system, the vacuum valve membrane returns to its place. However, this device also has significant disadvantages, namely:

• sticking of the membrane if the valve does not operate for a long time, that is, this option is not suitable for houses with periodic residence;
• membrane wear due to frequent opening and prolonged use.

From the above we can conclude that the vacuum valve needs to be changed periodically. However, this device is inexpensive, and replacing it is not a difficult task.

So, installing a sewer riser in a private house is mandatory if the house has two or more floors and there is a bathroom on each floor. In a small house, instead of a drain pipe, you can install a vacuum valve. You can design and build a fan riser yourself, but if difficulties arise, it is better to entrust the work to specialists. Only after the installation of the drain pipe is completed, the work on assembling the internal sewerage system can be considered complete.

In order for the drainage system to work properly, without causing inconvenience in the form of unpleasant odors, plumbing fixtures are equipped with siphons, and the sewerage system itself is equipped with a waste pipe. In small houses you can do without this design, but sometimes it is still necessary. It is not difficult to equip a fan pipe, but you need to take into account all the requirements for it and the subtleties of installation.

This is a fairly simple device - a separate, usually straight, branch of the sewer pipeline, led vertically upward to the street and connecting the sewage system to the atmosphere.

In cottages with bathrooms on several floors, the drain pipe is a continuation of the riser, leading above the roof. In houses where the drainage system is located on one floor and does not have a riser, the drain pipe is taken out from one of the sides of the transition node connecting the internal network with the external one, or from the point where the largest number of branches are connected to the main line.

Note! The ideal shape of a vent pipe is a vertical straight line, but when installed inside a house, this vertical line will have to intersect the floors and roof, which is not always feasible. To simplify installation work you have to change the shape of the structure: make a 90-degree turn using 2-3 elbow fittings when passing through the wall and direct the pipe upward again.

Purpose of the drain pipe

The sewer pipe serves to ventilate the sewer network, that is, to remove gases formed in the pipeline and supply fresh air if necessary.

When moving and mixing sewage discharged into a sewage system, various volatile substances are released that have an unpleasant odor and are also hazardous to health.

Installing sewer ventilation solves the problem of gas removal, preventing gases from accumulating in the pipeline.

Note! There is another, more important purpose of the drainage pipe - maintaining the pressure balance in the drainage system.

When flushing water from a bathtub, swimming pool, or using several sinks and toilets at the same time, residents pass a large volume of liquid through the pipeline at once. In this case, the volume of air in the system turns out to be critically small and a vacuum occurs - a decrease in pressure in the network.