The RadiCal R2E250 RB series AC Centrifugal Fan with 7-blade impeller and single phase fan motor. The R2E250 RB series features backward curved, thermal overload protector (TOP) wired internally. Fibreglass reinforced composite PA Impeller Clockwise direction of rotation Voltage - Rated 115VAC Size / Dimension Round - 255mm Dia Width 108.0mm Air Flow 1010.1 CFM (28.28m³/min) Noise 81.0 dB Power (Watts) 395W RPM 3050 RPM Termination 4 Wire Leads Ingress Protection IP44 Operating Temperature -13 ~ 140°F (-25 ~ 60°C)