Primary air filter is suitable for primary filtration of air conditioning system, mainly for filtration of 5 μ The dust particles are more than 5 m. There are three types of primary effect filters: plate type, folding type and bag type. The outer frame materials include paper frame, aluminum frame and galvanized iron frame. The filter materials include non-woven fabric, nylon mesh, activated carbon filter material and metal mesh. The protective mesh includes double-sided plastic spraying wire mesh and double-sided galvanized wire mesh.

Features of primary efficiency filter: low price, light weight, good versatility and compact structure. It is mainly used for primary filtration of central air conditioning and central ventilation system.