BP industrial fanhas High-power,stronger Exhaust,longer life BP Dampproof And Oil Proof Exhaust Fan Model No BP-30C BP-35C BP-40C Voltage 110v/220v 110v/220v 110v/220v Hz 50/60hz 50/60hz 50/60hz Leaf Diameter 290mm 345mm 400mm Fan Inside Diameter 300mm 350mm 405mm FAN External Diameter 356mm 397mm 482mm Holes Diameter 415mm 450mm 525mm Holes X Holes Diameter 4*12mm 4*12mm 4*12mm Power 110w 130w 160w Air volume ≤39 m3/min ≤44 m3/min ≤62 m3/min Sound Pressured ≤45 db ≤46 db ≤52 db Max Running Temperature 65K 65K 65K Fan speed 1450 r/min 1450 r/min (industrial fan)