1.in line fan 2.larger air volume,low noise 3.metal material(A3) 4.different sizes(4',6',8',10',12') In Line FanCircular Duct Fan is our newly develiped series with advanced tec-hnology absorbed from oversea and domestic. With standard size ,the inlet and outlet at the same diameter could be directly connected with the duct by saving cost in designing. The new design of housing,together with high ...