The only thing that can break this rule is freezing of the ventilation system.

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Advice! If the house is already in use and the ventilation draft is insufficient, deflectors can help. These devices are installed at the beginning or end of the pipe that rises above the roof.

They operate under the influence of wind and artificial separation of air masses by special diffusers. Deflectors enhance natural draft.

As is known, the draft force is directly related to the temperature chinese overseas british data inside and outside the house. It is for this reason that ventilation works incomparably better in winter than in the summer heat.

To prevent condensate from freezing on the pipe walls, it must be insulated. For this, any soft insulation is used, for example, mineral wool or basalt.


A very effective option is to lay ventilation ducts in close proximity to the chimney, heating system or hot water supply. These systems only work in cold weather, just when the ventilation pipes need to be heated.

The problem in this case may be the difference in temperatures in several ventilation ducts in the case when more than two are installed on one roof. With such an installation, when one pipe is heated and the others freeze, the air circulation in the house may be significantly disrupted. All this must be calculated at the design stage.

Another problem may be the lack of smoothness of the inner surface of the ventilation pipes. This leads to increased resistance, as a result of which air masses pass through the pipes more slowly, but condensation on their walls lingers for a long time.


Resistance can be reduced by choosing a suitable ventilation material with a perfectly smooth surface. All connections and joints of pipes should be made with the edges smoothed as much as possible.