S-Line Mixed Flow Fans are designed for residential and light commercial ventilation applications. These compact, powerful, and quiet fans are available in 6 in., 8 in. and 10 in. duct diameters and are ideally suited for either supply or exhaust ventilation systems. The fan and motor are precisely balanced for a quiet and vibration-free operation.This Vortex Powerfan kit includes a 711 CFM S-800 inline blower, for 8 in. Dia duct, and a current sensor that will automatically turn on and off the Vortex Powerfan S-800 inline blower as required.