Overview Product Description 1214 Backward Inclined Wheel 12-3/16" Diameter 12-3/16" Width 4-15/16" Bore Diameter 5/8 KEYED Hole Size 8-1/8" Radius 1" # of Blades 14 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. ****THERE IS A # WEEK LEAD TIME FOR THIS PART**** Product Videos Custom Field Product Reviews