The effective filtration area of the bag filter is large, the dust capacity is large, the resistance is small, and the ventilation capacity is large; the frame and the support frame can be reused. Filtration systems applied to electronics, pharmaceuticals, medical care, food and other industries, are structured medium-efficiency filters. G4 (35%), F5 (45%), F6 (65%), F7 (85%), F8 (95%), F9 (98%); Frame Thickness Series: 21mm, 25mm, etc.; (F 5,45%, white, for medium efficiency pre-filter) (F 6,65%, orange, for commercial buildings, theaters, stations, air stations) (F 7,85%, green, for spray room, school, computer room) (F 8,95%, pink, industrial, pharmaceutical, food, hospital) (F 9,98%, yellow, for electronics industry, factory, sterile room) Under the condition of rated air volume use, the filter needs to be replaced for 3-4 months; or when the resistance of the filter reaches 400Pa or more, the filter must be replaced; if the filter uses washable filter media, the lower The filter material can be rinsed with clean water or a solution containing a neutral detergent, cool to dry, and then replaced; two more washings are allowed, that is, a new filter must be replaced; if the dust concentration in the use environment is large, the service life cycle will also be reduced