exhaust fan / ventilation fan: 1250
Diameter blades (mm):1250
Automatic rotational speed: 439
Air-compressor rotational speed  (r/min):1400
Wind capacity: 44000
Whole pressure(Pa): 56
Noisedecibels:  <=70
Imports power (W): 1100
Rated voltage (V): 380
Specification(mm): 1400*1400*400