A common practice in the current housing construction is the use of percussive system of ventilation in which air supply is solved through the window gap. A common feature of such a method of ventilation is totally inadequate supply of ventilation air, which can lead to various undesired air suction holes (electrical outlets, riser, etc.).
Currently, when there are high demands on the airtightness of windows and doors, air intake system can not be solved by windows gaps for ventilation of buildings with a new or reconstructed windows. Ventilation infiltration may be allowed only in buildings where there is no possible replacement of original windows with new tight windows (historical buildings etc.).
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