Frame: Cast Iron Impeller: Aluminum Alloy Bearing type: Sleeve Bearing & Ball Bearing Motor: Impedance Protected Size: A: 422 B: 432 C: 485 Rated Voltage V: 24 Rated Current A: 0.4 Speed RPM: 1100 Max Pressure mmAq: 2.7 Maximun Air Flow m3/min: 5.4 Maximun Air Flow CFM: 191 Noise dB-A: 45 Weight g: 1000