Frame: Cast Iron Impeller: Aluminum Alloy Bearing type: Sleeve Bearing & Ball Bearing Motor: Impedance Protected Size: A: 303 B: 315 C: 365 Rated Voltage V: 24 Rated Current A: 0.30 Speed RPM: 1500 Max Pressure mmAq: 2.60 Maximun Air Flow m3/min: 3.50 Maximun Air Flow CFM: 124.0 Noise dB-A: 43 Weight g: 780