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Industrial negative pressure ventilating fans, 1. reduce temperature change air ., 2. environmental-friendly, 3. humidification - details see: https://www.machineto.com/industrial-negative-pressure-ventilating-fans-10207475

Industrial negative pressure ventilating fans

Model	Fan Blade (mm)	Fan Speed (RPM)	Motor Speed (RPM)	Capacity (m3/h)	Pressure (Pa)	Noise(db)	Power (w)	Voltage (v)	Size H*W*T(mm)
HYF-900	750	630	1400	28000	65	≤65	370	380	900*900*400
HYF-1000	900	610	1400	30000	70	≤70	750	380	1000*1000*400
HYF-1100	1000	600	1400	32500	70	≤70	750	380	1100*1100*400
HYF-1220	1100	460	1400	38000	73	≤70	750	380	1220*1220*400
HYF-1380	1250	439	1400	44000	56	≤70	1100	380	1380*1380*400
HYF-1530	1400	325	1400	55800	60	≤70	1500	380	1530*1530*400

See the below two photosfrontandback

working Principle :

when startup,the power is transfered to the fan blade by the motor through the triangular belt to produce strong airflow to open the movable shutter and is able to exhaust the dirty gas out from the chamber within a short time ,when shutdown, the shutter closes automatically to prevent down draught outside of the chamber and prevent dust from entering.