... will be taken away because of negative pressure, and fresh and filtered air will be pumped into through pad ... manufacturing factory, electronics, plastic, shoe, toy, hardware factory and so on2.Commerce: hall, supermarket, hotel, net bar, ... hospital, station, gym, school4.Animal husbandry: poultry house, pig, chicken, rabbit, cow barn5.Agriculture: horticulture, greenhouse. Fan Itempoultry fan1380 ...