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The ventilation system is a very important engineering structure that plays a key role in creating a good microclimate. It should be in every room, including non-residential and heating rooms — is no exception.

What is a ventilation system for?

Ventilation in the boiler room of a private house prevents an increase in the concentration of carbon monoxide in the air and fights such a common phenomenon as back draft. The spread of carbon monoxide is deadly, because an increase in its concentration in the air by only 0.2% leads a person to loss of consciousness, followed by respiratory arrest.

The heating boiler burns oxygen to maintain combustion, and the more powerful the boiler, the more it «eats» it. And how to replenish its concentration in the air of the boiler room, except through ventilation?

And ventilation should be, not anyhow. There are clear rules that are described in sufficient detail in SNiP 2-35-76.

  • In heating rooms equipped with gas boilers, it is recommended to provide three air exchanges.
  • The height of the building must be at least 6 m, if this is not possible, then it is necessary to increase the air ratio at the rate of 25% for each meter of reduction.
  • If the necessary air flow cannot be provided naturally, then installation of equipment for additional air exchange is required.

Calculation of the ventilation system

We will calculate for a room with the following parametersIn a heating room, it is not enough just to organize ventilation, it must be correctly calculated. Several factors influence the correctness of boiler room ventilation calculations:

  1. The volume of the boiler room.
  2. The speed of air movement through the ventilation ducts. For boiler rooms in a private house, this figure cannot be lower than 1 m / s.
  3. Increase in multiplicity depending on the lowering of the ceiling level.

Let’s consider an example of the correct calculation of the natural ventilation system in a private house in which the heating room is located, with dimensions of 2.5 m by 3.5 m and a ceiling height of 2.7 m.

  1. We calculate the volume of this room: 2.5×3.5×2.7 u003d 23.62 cubic meters
  2. Air exchange, taking into account all factors, will be: (6-2.7) x 0.25 + 3 = 3.8
  3. In an hour, air circulation in the boiler room should occur with a volume of 23.62 cubic meters x 3.8 = 89.76 cubic meters.
  4. Based on these data and the table provided, it is easy to calculate the required diameter of the ventilation ducts, which will provide the required air exchange (89.76 cubic meters).

The dependence of the air velocity on the diameter of the pipeBased on the data in the table, the diameter of the ventilation duct we need must be at least 180 mm. And we calculated only the exhaust channel. The supply pipe should have exactly the same parameters.

Rules for arranging ventilation

Ventilation of a room with a gas boiler can be either natural or forced. The main thing is that it meets all the requirements for air exchange and safety. There are several general rules, the observance of which will increase the efficiency of the ventilation system you have chosen:

  1. With natural ventilation of the boiler room, horizontal sections of air ducts cannot be used. If it is structurally impossible to achieve this, then an additional fan is installed in the channel. If the ventilation system is forced, then horizontal air ducts do not affect the efficiency of exhaust air removal.
  2. For effective operation of natural ventilation, traction is needed. To do this, the ventilation pipe must be located strictly vertically, and its height was at least 3 m.

Experts recommend installing additional backup ventilation in the heating room of a private house. In the event of failure of one, another can replace it, preventing a threat to the life of the inhabitants of the house.

Location of supply and exhaust channelsThe location of the channels is also very important for the operation of ventilation. The supply air should be located in the working area of ​​the heating boiler, in the lower part of the boiler room, and the exhaust, at the maximum possible distance from the first one, in the upper part.

Equipment of the boiler room in the presence of general house ventilation

Many people ask themselves the difficult question of how to make ventilation in the house so that it also covers the boiler room. In fact, the standard natural ventilation scheme, when the hoods are located in the kitchen and bathroom at home, will not work here. Either you will have to make a separate ventilation, specifically to the boiler room, or connect it to the general house forced air supply and exhaust system.

  • You can equip the boiler room with an air intake duct connected to the general exchange system at home, and install a duct fan of the required performance as equipment. In this case, it is imperative to use a fire damper.
  • There are options for the location of the room, with heating equipment installed in it, when the organization of natural air outlet is impossible due to the wrong location. In this case, experts recommend using a draft machine connected to the general ventilation of a private house.
  • And do not forget about the sufficient flow of air in the boiler room, since according to the fire safety rules, it must have a fireproof door, which must close quite tightly, so there will be no air flow from other rooms there, which means that natural air exhaust will also not work.

If you have just started a country house project, we recommend that you read an article about the design and functionality of a ventilation system for a private house.

The calculation and installation of ventilation ducts is a very responsible matter, which ensures its normal operation and the equipment installed in the boiler room. If you understand that you cannot cope with such work on your own, it is better to invite professionals. If you have a complex heating system with several heating units, it is still better to invite professionals.


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