Heng's 71112V2-C1 Vortex 2 Complete Vent Heng's Industries Vortex I Fan Don't just move air, create a Vortex; High velocity air-fan system; over 300 percent more air flow movement Easy, quick, and simple installation with only a phillips head screw driver Attractive radius corners are standard Non-powered vents can be converted with some additional wiring Vortex fan speed 188 CFM (188 cubic feet per minute) Vortex II Complete Vent is three speed forward, two reverse, with a 9 Inch blade; 7 Inch Height x 17 Inch Width x 17 Inch Length