industrial pre filter, dust holding air filter, air intake filter，G4Filter，PleatedAirFilter，CleanroomFilter，PreFiltration，PaperFrameFilter

This G4 pleated paper frame primary filter is designed for cleanroom, industrial workshop and commercial ventilation pre-filtration. The pleated filter media expands effective filtration area, offering higher dust holding capacity than flat filters. Hard paper frame bonds tightly with filter material to prevent air leakage. It efficiently intercepts coarse particles and reduces dust load on rear filters. Featuring stable performance and low airflow resistance, it fits fan coil units, fresh air systems and spray booth inlet air filtration. OEM size customization is available for different project demands.