The REF100-11/12/2 is a Centrifugal blowers use high speed impellers or blades to impart velocity to air. Like fans, centrifugal blowers offer a number of blade orientations, including backward curved, forward curved, and radial. Blowers can be multi- or variable speed units . Fan Type: Motorized Impellers Features Speed Sensor (Tach) Noise: 66.0 dB(A) Power (Watts): 7.50W RPM: 5400 RPM Termination: 3 Wire Leads Operating Temperature: -4 ~ 167°F (-20 ~ 75°C) Voltage Range: 8 ~ 15VDC Material - Frame Plastic, Glass Filled