Overview Product Description 1515 Backward Inclined Wheel 15" Diameter 15" Width 5-7/8" Bore Diameter 5/8 KEYED Hole Size 10-5/16" Radius 1-3/16" # of Blades 15 Rated 3450 RPM Aluminum Replaces such roof-top ventilator brands as: Chelsea, Green Heck, Acorn, and Penn Vent. Backward inclined wheels are designed to pull air into the opening (hole size) and discharge on all sides. With this in mind we can often replace a CW rotations wheel with a CCW rotation wheel by simply reversing the motor rotation. **May have a 2-3 day shipping window plus transit time** Product Videos Custom Field Product Reviews