The possibility of suck-back of fume cupboard exhaust gases into building air intakes, open Windows or the breathing zone of people working on the roof or in other buildings should be investigated.
应该调查通风橱废气回吸至房屋内的进风口、打开的窗户或者房顶工作人员的呼吸区域或者其它房屋的可能性。
Both linear and nonlinear track resistances are then discussed. Methods of computation with linear variable resistance are presented for the static zone and the breathing zone situated on the bridge.