... them:1)WUSUN1380 exhaust fan with 6 square meter of evaporative cooling pad can meet 500 ... --550m³.2)WUSUN1220 exhaust fan with 5 square meter of evaporative cooling pad can meet 450 ... 400--450m³.4)WUSUN900 exhaust fan with 3 square meter of evaporative cooling pad can meet 350 ... factory and so on2.Commerce: hall, supermarket, hotel, net bar, recreational place, guesthouse.3.Public: hospital, station, ...