Single Inlet Backward Incline Belt Drive Blower, Wheel Diameter 12 1/4 Inches, Shaft Diameter 1 Inches, Inlet Diameter 13 1/4 Inches, Inlet Area 0.921 Square Feet, Outlet Height 13 1/4 Inches, Outlet Width 9 5/8 Inches, Outlet Area 0.858 Square Feet, Mounting Hole Diameter 1/2 Inch, Maximum Inlet Air Temperature 250 Degrees F / 121.1 Degrees C, CW Rotation Viewed From Drive Side, Weatherproof Drive Cover Included, Without Motor, Recommended Motor Power Range 1/3 HP Thru 2 HP RestrictionsNote: Review OSHA Codes. OSHA complying guards are required when fan blades are exposed and within reach of personnel. The A weighted sound ratings shown have been calculated per AMCA Standard 301. Values shown for blowers are for (inlet Lwi) sound levels for: Installation Type B: free inlet, ducted outlet. Ratings do not include the effects of duct end correction. Backward Incline Belt-Drive BlowersMotor cannot be overloaded at any given rpm and horsepower regardless of static pressure applied to the system. Clockwise rotation viewed from drive side. Blowers are shipped in bottom horizontal discharge position and can be changed in the field to 7 additional standard discharge positions. Sizes 10-1/2" to 20" have variable-pitch sheaves; larger sizes have fixed sheave drive. Include weatherproof drive cover. Drive packages are packed separately.Nonoverloading, dynamically balanced wheels Sizes 10-1/2" to 24-1/2" feature flat blade wheel; sizes 27" to 36-1/2" have airfoil wheel Both wheel styles provide full Class 1 performance range Welded steel housing Gray baked-on epoxy finish Max. inlet air temp.: 250 F Max. ambient: 104 F Pillow block ball bearings