... technologies, energy efficient operation, more reliable than air-conditioning, lower cost.Completely solved dust and ... 406080100HeaterWOptional300 , 500500 , 800, 1000Air Flowm3/hInternal air flow240360490620Fan type Backward Centrifugal FanTemp.°COperating range-40 ~ ... , 800, 1000800, 1000,2000Air Flowm3/hInternal air flow72092012001500Fan type Backward Centrifugal FanTemp.°COperating range-40 ...