Ventilation of accomodation in warmed buildings well with tight windows' joinery is perturbed. The two-function heaters which are more and more frequently installed in the flats make up additional problem. This article presents results of reaserch on example of two apartments furnished with Individual System of Air Intake. This system causes reduction of CO2 concentration in rooms. Valus of this parameter has been under permissible valus (1000 ppm). The air humidity has decreased what causes reduction of the stuffy air feeling the room. In result of ventilation system action, the working of two-function water heaters has not been perturbed.
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