The early effect of the filter to apply to the primary filter of the air-conditioning systems, mainly used to filter dust particles above 5μm. The early effect of the filter plate, folding, paper box frame materials, aluminum frame, galvanized iron box, filter material, non-woven nylon mesh, activated carbon filter, metal hole net, protective nets double-sided jet plastic barbed wire and two-sided galvanized wire 
 Mainly used for: 
 ● Central air conditioning and centralized ventilation system pre-filtration 
 ● Large air compressor pre-filter 
 ● clean air return system 
 ● pre-filtering of local high efficiency filter device 
 The efficiency of high temperature air filters, stainless steel frame, high temperature 250-300 ° C filter 
 This efficiency filter, primary filter commonly used in an air-conditioning and ventilation systems, filtered just a simple air-conditioning and ventilation systems. 
 G-series coarse air filter is divided into eight varieties, namely: G1, G2, G3, G4, GN (nylon mesh filter), GH (metal mesh filter) GC (activated carbon filter), GT (high temperature coarse filter).