... vane wheel and belt roller 2)casting steel main roller 50" axial exhaust poultry/green house fan:fan can get hotness ... operating life6)details and capacity:Blade sizeFrame SizeMotorSpeedBladeFrameCapacity(m3/h)50''138cmX138cmX40cm1.5HP,380V,2.7A,50HZ,3phase1400r/min5012Alsteel43,00043''110cmX110cmX40cm0 ... ,00050''138cmX138cmX40cm1.5HP,380V,2.7A,50HZ,3phase1400r/minS.steelsteel42,000