External rotor circular duct design; compact, high efficiency, low vibration, low-noise; moisture-resistant with IP44 protection rating when installed in duct systems.Air supply, exhaust, return, and filtration for hotels, premium clubs, supermarkets, storage rooms, rest rooms, and residential kitchens.Gas must be free of viscous or corrosive substances; strictly prohibited for conveying abrasive dust, soot, or flammable and explosive materials.

