AIR EXCHANGE-RATES IN DWELLINGS AND WORKROOMS

Because of the energy saving constructions and the use of pollutants c ontaining construction materials is the natural air exchange rate of n ew or redecorated buildings often underneath 0.5 h(-1) which is to low from the hygienic point of view. It is demanded an air exchange rate between 0.8 h(-1) and 1 h(-1) in used rooms. We are giving an overview about air exchanging rates and we are presenting a method for measuri ng air exchange rates which we further developed. Through a thermostab ilisated tracergas source the tracergas is emitting continuously into the room. The evaluation is made by GC/ECD. It is possible to detect a ir exchange rates until 0.01 h(-1). Some results from our institute ar e presented too.