Medium-effect filters belong to F series filters among air filters.F series medium-effect air filters, of which the bag type includes F5, F6, F7, F8, F9.Note (F5, F6, F7, F8, F9) for the filtration efficiency (colorimetric method), F5: 40-50%, F6: 60-70%, F7: 75-85%, F9: 85-95%.

F5-F9 bag filter with its unique bag structure ensures that the airflow is balanced to fill the whole bag, which can prevent overcrowding or leakage between bags, thus reducing the resistance and maximizing the dust capacity; unique firm riveting technology prevents the filter from being deformed or coming out of the frame under the extremely poor working environment; unique heat fusion technology prevents overcrowding or leakage between bags, which reduces the resistance and maximizes the dust capacity. This reduces drag and maximizes dust holding capacity. A reinforced "bag support grille" prevents the filter from shrinking or bending under extreme operating conditions.

Medium-duty filter bags are ideal for medium-duty filtration in humid, high airflow and dust-loaded environments. Bag filters have successfully proven their value and performance in applications that raise industry standards.

It is mainly used in the intermediate filtration of central air-conditioning ventilation system, pharmaceuticals, hospitals, electronics, food, and other industrial purification, and can also be used as the front-end filtration of high-efficiency filtration in order to reduce the load of high-efficiency over and prolong its service life; because of the large wind-facing surface, it has a large amount of empty dust and low air velocity, and it is considered to be the best structure of intermediate-effect filters.