Qinghe Air Filter

Filter media selection: needle-punched, synthetic, micro-glass and carbon

Standards

Media choice follows the duty: needle-punched non-woven for coarse pre-filtration, synthetic fibre for general HVAC strength, micro-glass for HEPA efficiency, and activated carbon for gaseous odour and vapour removal. Pick the media that serves the target contaminant and the required grade before considering roll or cut size.

Coarse pre-filtration: needle-punched and synthetic

Needle-punched non-woven media captures large particles in HVAC pre-filtration and spray-booth duty. Synthetic fibre adds strength and washability for general ventilation. These grades trade low initial resistance for high capacity, protecting the finer stages behind them.

Fine and HEPA: micro-glass

Micro-glass fibre provides the fine-fibre surface needed for HEPA and ULPA efficiency. It is less robust than synthetic media and depends on upstream pre-filtration to reach a full service life. When a spec calls for H13/H14 or higher, micro-glass is the working media, with mini-pleat or separator construction to hold the area.

Odour and vapour: activated carbon

Activated carbon adsorbs gaseous odours and chemical vapours that particulate media cannot touch. It is contaminant-specific, so the target — odour, VOC or a named chemical — determines the carbon weight and contact time. Carbon media complements particulate stages; it does not replace them.

From a sourcing perspective

From a sourcing perspective, we recommend stating the duty — coarse pre-filtration, HEPA or odour control — before discussing rolls, because the media type follows the duty and each type trades differently between resistance, capacity and efficiency. Our advice is to confirm roll width, grammage and any fire-rating requirement up front, and to request an efficiency curve for the target particle size rather than accepting a nominal grade. In our experience, a nominal grade does not by itself confirm performance across the size range that matters to you.

Sources