Name: Silent booster duct fan Air volume: (high) 530/(low) 410m3/h Noise: (High) 31/(Low) 26dB Weight: 4.0kg Frequency: 50Hz Size: length 488* width 220* height 243mm Power: (High) 50/(Low) 43W Wind pressure: (high) 300/ (low) 240pa Speed: (high) 2550/(low) 1850r/min Caliber: 148mm Voltage: 220V