Features: 1. Large air flow,low resistance, small running wastage. 2. It adopts non-woven filter media. It can effectively to wipe off the dust particulate and high efficiency. 3. It is supported by protected-net on the surface. It is well-knit and long life-span. 4. Large dust holding capacity, good performance and low price. Application field: It is used for centrality air conditioner and purifying equipment which is initial filter.