Frame: Cast Iron Impeller: Aluminum Alloy Bearing type: Sleeve Bearing & Ball Bearing Motor: Impedance Protected Size: A: 242 B: 254 C: 305 Rated Voltage V: 24 Rated Current A: 0.25 Speed RPM: 1600 Max Pressure mmAq: 2.80 Maximun Air Flow m3/min: 2.90 Maximun Air Flow CFM: 102.0 Noise dB-A: 42 Weight g: 690