... saving,big wind capacity 3high strength,over 10years service time 4CCC,CE,ISOcertificate 1, JHF-400A greenhouse circulation fan ... more increase in air. 4 blades with aluminum material, a one-time stamping molding, wide-angle, light weight, excellent corrosion resistance, ... , suspension fasteners: Stamping die, the use of stainless steel, outside is more attractive to use more secure, the angle can be ...