Multi-pocket filter * The perfect choice for air conditioner ventilation system. * The fiber media can hold a large quantity dust.The efficiency is stable in the whole life-span. * Optimized V-collector structure has low resistance and long life-span. * The average efficiency is 45%, 65%, 85% and 95% by colorirmetry (ASHRAE 52.1-1992). * Filtration efficiency grade: F5, F6, F7, F8, F9 (EN779). Carton packing, then several cartons by one pallet.