... supermaket, chemical plants, big factory workshops etc.Negative-pressure ventilating fan series are designed scientifically. Low cost, low noise, good ... making, glass, rubber, food processing, etc.2. Civil field: super markets, cyber club, big dinning hall, waiting room etc.3 ... -900B1000*1000*4000.55 shutter, frame, wind set, fan blade are galvanized9FJ-1000B1100*1100*4000.759FJ-1250B1385*1385*4001 ...