Frame: Cast Iron Impeller: Aluminum Alloy Bearing type: Sleeve Bearing & Ball Bearing Motor: Impedance Protected Size: A: 362 B: 372 C: 425 Rated Voltage V: 24 Rated Current A: 0.4 Speed RPM: 1200 Max Pressure mmAq: 2.9 Maximun Air Flow m3/min: 4.7 Maximun Air Flow CFM: 166 Noise dB-A: 45 Weight g: 920