... 4) low noise ZR series industrial energy saving push-pull wall-mounted centrifugal exhaust fanFrame, frames are made of galvanized board, thickness ... , 1410r/m, IP55, class F, efficiency 90%, top/foot mounted, certification, CCC.(motor can be supplied as demand)Motor bearing ... 50≥1400480001500≤643801380x1380x450235USD ZR series professional energy saving push-pull wall-mounted centrifugal exhaust fan