Product SKU:ALM-HDEF-18-150 Size:18Inch Speed:900RPM No of Blades:4 Warranty:2 Years Power:150W Air Delivery(CMM):3900 Phase:Three Current:0.30A Sound Level:55-60dB Every Almonard Exhaust Fan features a capacitor star and run type motor continuously rated, totally enclosed and ruggedly built. Designed specifically for the purpose, the motor has prelubricated double ball bearing and is provided with Class A and E insulation. The end result is a smooth, silent motor that lasts longer and deliver the maximum output at lower operating cost The impeller used in an ALmonard Exhaust Fan is of the propeller type and since both hub and impeller are dynamically balances and frames and arms mounted on rubber bushing, vibration are virtually eliminated