Frame: Cast Iron Impeller: Aluminum Alloy Bearing type: Sleeve Bearing & Ball Bearing Motor: Impedance Protected Size: A: 242 B: 252 C: 305 Rated Voltage V: 24 Rated Current A: 0.3 Speed RPM: 1400 Max Pressure mmAq: 3.5 Maximun Air Flow m3/min: 3.5 Maximun Air Flow CFM: 124 Noise dB-A: 43 Weight g: 740