Supply of primary filter paper box paper box G4 Tianjin primary filter air filter paper box manufacturing plant in Tianjin Clyne washable primary filter plate is composed by a sturdy aluminum frame Removable corners with corners form Rugged smooth deformation. This form easy to disassemble for easy replacement of the filter and reach framework reuse and reduce costs. Washable pre-filter plate filter is used in the inner layer Spewing synthetic fibers, with a high resistance to fracture, low initial resistance, fire resistance. Filter ribs, picture frames can be used either in the form of barbed wire attached cotton enhancement filters ruggedness. Balanced equal spacing and multiple rib design to ensure a high pleated filters, which filter plate when in the path of least resistance for maximum dust holding capacity. This filter can be reused many times cleaning, long service life, saving the cost of production; fluffy becoming dense fibrous structure, to ensure a higher rate and larger dust gather dust holding capacity, effectively extending the validity of its backend filter life. Regular size generally have: 2 inches (46mm) and 4 inches (96mm) of different thicknesses to choose from, 2 inches and 4 inches are made of pleated structure. Optional filtering level: G2, G3, G4 (EN779)