range hood duct: used for range hood or other home appliances to discharge polluted air. range hood duct1,Apply for low /medium / high pressure, ... will be prompt .6,Diameter Range : 75-1200MM (3.5"-4.8")7,Temperature Range: -30oC~140oC8, Max.Air Velocity ... : 30M/S .9,Working Pressure : 2500pa10,Standard Length : 10M ,or as ordered range hood ...