Owners of private houses, as a rule, use a cellar for storing food. But due to the lack of windows, the room is deprived of a normal level of air exchange. This leads to increased humidity, the formation of mold with mold, accelerated spoilage of products, which is very unpleasant, is not it?
Do you want to prevent such problems, but do not know how? We will show you the solution - after all, properly organized ventilation of the cellar with two pipes will help to ensure the flow of air. And you can do it on your own.
The main stages of the work and arrangement rules are discussed in detail in our article. The material is supplemented by visual photo instructions and provided with detailed video recommendations for organizing optimal climatic conditions in the cellar. Having studied that even a novice will be able to figure out the basics of installing a ventilation system at home.
Basement Requirements
Basement, as a rule, is in every private house. Many residents of the private sector equip it with utility rooms, a cellar, arrange saunas, gyms, and relaxation rooms, which requires the arrangement of a complex system of forced ventilation.
However, most often the basement is used to store food stocks, which although they need a certain microclimate, but do not require a forced draft device.
In this case, it will be quite enough to make natural ventilation.
The absence or inadequate ventilation of the cellar is the main reason for the increase in humidity and the formation of mold
Nevertheless, in order to ensure the safety of products and the proper functioning of the cellar, it is necessary to adhere to certain rules in the arrangement of this room.
Let's consider them in more detail:
- Avoid getting into the basement with natural light. There should be no windows in the basement; periodic use of electric lighting is allowed.
- Organize a favorable temperature regime. To do this, arrange the cellar so that one of its sides is in contact with the outer wall of the house.
- Ensure normal air exchange in the room, which is ensured by the presence of ventilation.
- Maintain room humidity. The optimal indicator is about 90%. This parameter also depends on ventilation.
- Provide good waterproofingto prevent groundwater from entering the cellar.
From the above list of requirements for the proper arrangement of the basement, it can be seen that two of the five necessary conditions are provided by ventilation.
But in order for it to function effectively and create an optimal mode for storing products, certain rules for its installation must be observed.
The most elementary ventilation system are the air vents, which are installed in the basement from opposite sides of the house. They are suitable for small cellars with a ceiling height of not more than two meters. To prevent debris from entering the cellar and rodents to crawl, open the holes with a grill
Inadequate ventilation of the room leads to an increase in humidity and the formation of mold, excess can cause excessive dryness of the basement, which will also adversely affect the safety of the crop.
Therefore, here you need to adhere to the rule of the golden mean, but in order to comply with it, it is important to make the correct calculations, which depend on the size and characteristics of the room.
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Ventilation - a must for cellars and cellars
Supply opening in the basement of the house
Asbestos exhaust pipe from the cellar
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Basement Ventilation
Ventilation of cellars with products
Single pipe ventilation system
The principle of the natural system
The operation of a natural-type ventilation system is based on physical law. The temperature difference inside the building and on the street leads to the movement of air flow and constant air exchange.
Warm air from the inside rushes to the ceiling, and cold air masses coming from the street take its place.
The figure shows the distribution of warm and cold air flow in a closed basement when using forced-air and exhaust ventilation
There are no windows or other openings in the basement for air inlet and outlet. To organize a constant circulation of air in a closed room, it is necessary to equip it with exhaust and supply air ducts.
The first serves to remove warm stagnant air from the cellar, the second - provides fresh cold air flow from the street.
To ensure that the room has the optimum temperature and good heat transfer, the ventilation ducts should be located as far as possible from each other.
The longer the distance that the air flow passes, the better and better the room is ventilated.
The supply and exhaust ducts must be installed so that the air has a place "where to walk up." This will help to create good air exchange in the room and the necessary temperature conditions for stored products.
Recommendations for choosing a ventilation
There are several significant points to consider when designing a system. The operation of natural ventilation depends in many respects on the climate characteristic of the area, season, outdoor temperature.
It is most effective in winter, because in the cold season there is a big difference between indoor and outdoor temperatures, which ensures good air circulation.
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Installation of ventilation holes during construction
Enhanced ventilation and product formation
Supply fan
Exhaust fan
But at the same time, there is a danger of excessive increase in air exchange, which is not good, because frosty air can lead to freezing of the cellar, and, accordingly, of the products stored there. Therefore, it is necessary to monitor the temperature and with a significant decrease, close the products.
In the summer, when the difference between the internal and external temperature conditions is minimal, the air circulation can completely stop. Therefore, the supply and exhaust system based on the principle of natural ventilation is not suitable for installation in regions with a hot climate.
In such climatic conditions it is necessary to use a combined ventilation system.
To equip the ventilation of a small cellar, you can limit yourself to one pipe. But in order for it to be able to simultaneously operate on the outlet and intake of air, it must be divided along two vertical channels into two channels.
Each channel has its own valve, which controls the intensity and speed of the inflow and outflow of the air stream.
You can check the functioning of such ventilation by attaching a piece of paper to each outlet.
When installing single-pipe ventilation, the pipe is divided into two independent channels, one of which serves to receive street air, and the other is designed to remove warm air masses from the room
Ventilation system equipment
For the arrangement of ventilation ducts, various types of pipes are used - asbestos-cement, plastic or galvanized metal - of a square, less often round cross-section.
Option # 1 - asbestos-cement structures
Asbestos-cement pipes are resistant to corrosion, can withstand frost and moisture, have a long service life. Such pipes have a sufficient length that allows you to mount the duct without welding.
Asbestos cement pipes have many advantages, but care must be taken when transporting and installing them, as they are brittle and may break.
Option # 2 - galvanized metal pipes
Galvanized pipes are lightweight and relatively low cost, they are corrosion resistant and easy to install.
Galvanization is suitable for wet rooms, where it will serve reliably and for a long time under suitable operating conditions, but if they are broken, the zinc coating may be damaged.
Galvanized steel pipes are often used as an air duct when organizing a ventilation system with your own hands. Their main advantage is light weight and ease of installation
Option # 3 - plastic pipes
Most often, plastic pipes are used to organize ventilation. Smooth inner surface provides good airflow.
Plastic ducts do not require cleaning and do not rust, their service life is more than twenty years, and their price is noticeably lower than pipes made of other materials.
The main disadvantage of plastic structures is the high combustibility of the material, so they can not be installed in rooms where it is possible to increase the temperature to extremes
How to determine the diameter of the pipes?
The determining factor in ventilation efficiency is the proportionality of the duct section of the area of the room where it is installed. It’s easy to calculate the required pipe size.
Experts advise in the calculations to adhere to the following rule: per 1 sq.m. the basement needs 26 sq. cm. sections.
It turns out that for every centimeter of pipe diameter there is 13 square meters. see sections. Based on this, you can calculate the desired pipe diameter according to the following formula:
(S cellar × 26) ÷ 13
For example, if the quadrature (S) if the room is 8 sq.m., it turns out that for the cellar you need to purchase a pipe with a diameter of 16 cm.
(8 × 26) = 208 ÷ 13 = 16 cm.
If single-pipe ventilation is installed in the cellar, then the diameter of the duct should be larger. In this case, it is recommended to use a pipe with a cross section of 17 cm for the basement of this area.
You may also be interested in information on calculating the area of air ducts, discussed in our other article.
Duct Installation Rules
To organize the supply and exhaust ventilation system, two ducts are needed. To ensure uniform air circulation, pipes of the same diameter are used. To accelerate the withdrawal of stagnant air, it is allowed to install a chimney of a slightly larger cross section.
Ducts are located at a considerable distance from each other in opposite walls of the room. Thus, the most favorable conditions for airing the cellar are created.
It is desirable that along the route of the pipes, there should be as little as possible, and even better not be sove, bends and turns.
The farther the pipes are from each other, the better the air circulates throughout the basement
An exhaust pipe is installed in one of the corners of the basement. Its lower end should be near the ceiling itself (about 1.5 m from the cellar floor) so that all the warm air that goes to the upper part of the room is completely brought out.
The duct passes through all the premises of the house and is displayed on the roof at a height of one and a half meters above the ridge.
With the passage of air masses, condensate accumulates in the pipe, and in winter frost forms inside it. To avoid this, it is necessary to insulate the duct located on the street.
For this, a larger pipe is put on top, and any insulation is placed in the formed space.
The outlet is closed with a fine mesh. But it is best to install a ventilation deflector on the pipe head, around which an artificial vacuum is created, which contributes to an increase in traction.
If the supply air duct is discharged through the roof, it is necessary that its intake opening is located below the edge of the exhaust pipe
The supply air duct is located in another corner of the cellar, its open end should rise above the basement floor by 40-50 cm. It is necessary that the opening of the supply pipe is one meter lower than the exhaust pipe. The pipe can be run through the house and exit to the roof of the building.
It should be borne in mind that the intake inlet on the roof should also be below the exhaust, in this case, a large difference in air pressure at the inlet and outlet is created, which contributes to increased traction and improves air flow. Therefore, the outer edge of the pipe is raised on the roof no higher than 20-25 cm.
The intake hole is led out through the wall to the outside of the house at a distance of about 30 cm from the ground
Often when arranging a basement under a residential building, the supply air duct is led out through the basement into the hole made in the outer wall of the building.
Outside, a grille is put on the supply pipe, which prevents dust and debris from entering the hole and does not allow rodents to get into the cellar.
Inside the basement, special dampers must be installed in each duct, the opening or closing of which regulates the intensity of air intake and outflow.
The supply pipe can be removed from the basement by installing it outside the house. In this case, the duct opening is raised about 80 cm above the ground
Installation of a natural ventilation system
It is desirable to design and install the ventilation system at the stage of building a house. During this period, all work is much simpler than installing the duct in the finished box.
However, this is not always possible, often the duct is installed in an already finished structure.
If the ventilation is installed during the construction of the cellar, a recess is made in the ground for laying the exhaust duct. A hole is left in the brickwork where the pipe is discharged
If the installation of ventilation is carried out in a separate cellar, then a hole is made in its ceiling where the exhaust pipe is discharged. It is strengthened inside and outside the premises in accordance with the recommendations given above.
When arranging the ventilation of a cellar located under a residential building, the exhaust duct must be installed in the place where the common house ventilation duct that goes to the roof of the building passes.
On the opposite side of the basement, a hole is made in the ceiling or in the upper part of the wall for installing the supply pipe. In a separate cellar, the pipe is led to the roof below the level of the exhaust duct.
In the cellar under the residential building, the conclusion is made to the outer wall of the building. Inside the basement, the pipe drops to a distance of 30-50 cm from the floor.
The exhaust duct of the basement located under the house, as a rule, is built into the common air duct, and the supply pipe is discharged into the side wall
After installing the supply and exhaust ducts, it is necessary to close their outer holes, and install dampers inside the pipes. Condensation can accumulate in the outlet channel even when insulated in severe frosts, therefore it is recommended to install a tap in the bottom of the pipe to drain the water.
To check the operation of the ventilation system, thin paper must be attached to the inlet. If the duct works normally, the sheet will flutter.
Fume exhaust pipe installation guide
Consider a practical option for enhancing cellar ventilation by installing a high exhaust pipe.
According to earlier calculations, such a solution will increase the hood, and besides, it will allow you to leave the zone of wind backwater created by neighboring buildings and trees. As planned, the pipe is installed on the ventilation duct:
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To increase the hood, we acquired a polymer pipe and fasteners. The pipe was cut to 2.1 m, because it will be mounted on a fume hood
In order to protect the ventilation duct from insects, birds, dust and soot suspended in the air, a deflector is attached to the upper edge of the pipe
Having departed from the top of the pipe about 1/4 of the entire length, fix the clamp to which the extensions will be attached. The clamp shown in the example is composed of two ordinary ones, only parts with loops are taken
The hole required to install the ventilation pipe is marked on the surface of the ventilation duct.
Everything necessary for forming and arranging a hole for installing a pipe is transferred to the roof
According to the marking, a hole is cut out in the ceiling of the ventilation duct
If the hole does not allow the ventilation pipe to be installed strictly vertically, it is adjusted
In order not to damage the polymer pipe during installation, an asbestos guide is installed in the hole
Step 1: Purchasing accessories to enhance the hood
Step 2: Installing a deflector to protect against external influences
Step 3: Fixing the clamp with stretch loops
Step 4: Marking the location of the pipe hole device
Step 5: Carrying tools and accessories to the roof
Step 6: Forming a hole using a grinder
Step 7: Correct the hole if necessary
Step 8: Installing in the Guide Hole
Upon completion of the assembly directly of the exhaust pipe and the device, the holes for its installation begin installation.
The tall pipe will be reinforced with braces to help it resist gusty winds:
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On the anchors, the washers included in the configuration are changed to a reinforced version
For the location of the anchors, the most suitable points are selected. Holes are drilled in them, anchors are placed and treated around with sealant.
A metal cable is threaded through the eye of the anchor and rigidly fixed with a cable tie with two bolts
Using lanyards, the cables are attached to the clamp fixed on the pipe, which makes it possible to tighten them in case of loosening
Around the pipe, the gaps are blown with foam, trying to fill both the space between the guide and the ceiling of the duct, and the gap between the plastic and asbestos pipe
Until the foam has frozen, the position of the pipe can be slightly adjusted. It should stand strictly horizontally
After the foam has hardened, cut off the excess, trying to give it the shape of a truncated cone
After trimming excess foam, this peculiar cone is treated with bitumen mastic.
Step 9: Replacing the washer on the anchors with a reinforced version
Step 10: Install Anchors at the Most Suitable Points
Step 11: Attaching the Cable Through the Anchor Eye
Step 12: Fixing the cable at the pipe with lanyards
Step 13: Blowing Foam Holes
Step 14: Leveling the structure if necessary
Step 15: Cut off excess foam
Step 16: Processing the base of the structure with mastic
The home craftsman who developed and put this idea into practice put a fan on the air inlet as an addition. In this way, he improved air exchange, thanks to which he quickly gets rid of moisture in the cellar flooded during the flood period.
Features of the combined system
In cases where natural-type ventilation does not cope with its functions, a more advanced combined ventilation system is used.
Various natural factors do not influence its work, it does not depend on the temperature difference inside and outside the building and can function effectively year-round.
Combined ventilation is equipped in the same way as natural: with the help of supply and exhaust pipes.
In addition, a fan is mounted in the exhaust duct, which contributes to the rapid blowing of stagnant air from the cellar, instead of which clean street air enters the basement.
In large rooms, the device is also installed in the supply air duct. In the basements of a small area, it is not economically feasible to put a fan on the inlet channel for continuous operation, since there will be a large consumption of electricity.
With the help of a fan installed in the inlet of the supply air duct, it is possible to quickly drain the room if natural ventilation does not cope well with this task.
The figure shows how the duct fan should be installed in the exhaust duct
To equip the combined system, fans with power up to 100 watts are used. For installation, channel and axial devices are suitable. The former are convenient in that they differ in economical operation and do not require large energy costs. They can be installed anywhere in the duct.
Among channel fans, the most efficient are devices with an amplitude motor.
Axial fans provide more powerful air flow, but they also require much more energy. When installing devices of this type, it is recommended that a non-return valve be installed in the pipe to block the entry of cold air into the room.
Optimal microclimate in the cellar
To preserve food, you need to create a favorable microclimate in the basement. Of great importance is the level of humidity in the room.
The equipment of the cellar with a ventilation system is undoubtedly an important, but far from the only condition for maintaining optimal humidity and the required temperature regime.
It is necessary to make a good waterproofing of the basement and periodically conduct a series of measures to drain it. There are several ways to get rid of excess moisture.
With high humidity, you need to ventilate the basement more often. This is especially true in the summer, and if natural ventilation is installed in the cellar.
To get rid of dampness and lower the level of humidity in the basement, it is necessary to ventilate it by opening the entrance hatch
To dry the basement, you can use simple, but quite effective methods. For example, ordinary coarse salt and quicklime absorb moisture well. They can be brought into the basement and left there for a while.
Another old method used by our grandmothers: put a lighted candle near the exhaust pipe. The flame creates a strong draft in the duct, due to which the circulation of the air flow is accelerated.
This method works only in a small cellar, and even with this condition, it will take several days to dry the room.
To prevent the candle from falling, it must be installed on a flat metal surface
You can dry the cellar with an electric heater, heat gun or fan, which are installed in the middle of the room. But all these methods are quite expensive, because require large amounts of electricity.
Sometimes on the contrary, you need to increase the humidity in the cellar. In these cases, water can be sprayed using a spray bottle. A good method is to put a box of wet sand in the basement or sprinkle sawdust on the floor, they must be periodically sprayed with water.
Various methods of draining the basement are presented in the following video:
You will learn how to install a fan in the duct from the following video:
Cellar - a closed unventilated room in which adverse conditions are created that contribute to the formation of mold, fungus and dampness.
There is only one way to get rid of negative processes - by equipping an effective ventilation system. Why it is not necessary to have special knowledge, almost every man can cope with this task.
Do you know a different way of arranging ventilation and have been using it effectively for more than one year? Is your cellar ventilation system different from the options discussed in our article? Please tell about it to people who first encountered this issue - leave your comments here.