503mm (19.8in) to 783mm (30.8in) lengths. DC Brushless type motor, temperature resistant aluminum alloy, ball or sleeve bearings. Maximum Pressure: 1.3mmAq (0.051inH2O) to 1.7mmAq (0.066inH2O), Maximum Air Flow: 243CFM (6.9m3/min) to 423CFM (12.0m3/min).