Get current pricing for Chicago, D4-7.5-213 Chicago Blower 7.5 Hp Centrifugal Blower. Size D4-7.5-213. Blower Has A 6 Diameter Inlet And 2.75 X 2.75 Top Outlet. Blower Fan Blade Is 15 In . Product Category: Process Equipment, Sub Category: Process Blowers: