... long-lasting circulation 4) low noise ZR series industrial energy saving push-pull wall-mounted centrifugal exhaust fanFrame, frames are made ... -pole speed, 1410r/m, IP55, class F, efficiency 90%, top/foot mounted, certification, CCC.(motor can be supplied as demand ... system, push-pull centrifugal opening system.Rivets, aluminum alloy and stainless steel rivets.Cable, 1 meter long, strong robber ...