(1) Coarse filter

The filter material of the coarse filter is generally non-woven fabric, metal wire mesh, glass wire, nylon mesh and so on. Commonly used coarse-effect filters include: ZJK-1 automatic winding herringbone air filter, TJ-3 automatic winding flat air filter, CW air filter, etc. Its structure includes plate type, folding type, belt type and winding type.

(2) Medium-efficiency filter

Commonly used medium-efficiency filters are: M-I, II, IV foam plastic filters, YB glass fiber filters, etc. The filter material of the medium-efficiency filter mainly includes glass fiber, medium-fine-pore polyethylene foam and synthetic fiber felt made of polyester, polypropylene, acrylic, etc.

(3) High efficiency filter

Commonly used high efficiency filters are GB type and GWB type. The filter material is ultra-fine glass fiber filter paper with very small pores. Using a very low filtration rate, which enhances the screening and diffusion of small dust particles, so it has a very high filtration efficiency.

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