Inline Duct Blower Round Centrifugal With Drive Package Wheel Diameter 18 In Drive Type Belt Drive CFM @ 0.000-In. SP 4418 @ 0.125-In. SP 4320 @ 0.250-In. SP 4223 Voltage 208-230/460 Motor HP 1-1/2 Height 47-5/8 In Width 26-1/8 In Maximum Depth 31 In Inlet Diameter 30-3/8 In Outlet Diameter 30-3/8 In Mounting Position Horizontal or Vertical Finish Polyester urethane Type B Spark Resistant Construction AMCA Sound Air UL/cUL 705