suction fan:air cooler,exhaust fan 1.Negative pressure fan 2.A large negative pressure ventilation 3.Cooling systems 4.Industrial vacuum fan 5.Galvanized plate:0.8mm 6.BladeStainless steel 7.Motor Samsung Korea 8.Principle of work,after boot generate airflow fan motor drive, air supply row, the shutters open automatically when the shutter is closed down, dirty ventilation indoor hot gas discharged into the natural flow of fresh air 9.Characters,Chijiu fan with a large amount of wind, low noise, low-power, smooth operation and long service life, beautiful appearance, easy installation, etc Size (cm): Motor (kw):Speed (r/m):Air Flow (m3 / h)Noise (dB)106*106*40 0.75 45035500 60