Overview Similar Products –> Product Description 1012 Backward Inclined Wheel 10″ Diameter 10″ Width 4-13/16″ Bore Diameter 1/2 Hole Size 6-11/16″ Radius 7/8″ # of Blades 12 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