Frame: Cast Iron Impeller: Aluminum Alloy Bearing type: Sleeve Bearing & Ball Bearing Motor: Impedance Protected Size: A: 123 B: 135 C: 185 Rated Voltage V: 24 Rated Current A: 0.40 Speed RPM: 2500 Max Pressure mmAq: 6.30 Maximun Air Flow m3/min: 2.00 Maximun Air Flow CFM: 71.0 Noise dB-A: 49 Weight g: 520