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 230VAC Size / Dimension Round - 255mm Dia Width 108.0mm Air Flow 1006.5 CFM (28.18m³/min) Noise 81.0 dB Power (Watts) 390W RPM 3100 RPM Termination 4 Wire Leads Ingress Protection IP44 Operating Temperature -13 ~ 131°F (-25 ~ 55°C)