Synthetic pocket filter The primary bag filter is used in holding up big diameter's dust, and it adopts new kind of multiple non-woven and synthetic fiber media and make abg type which have characteristic of low resistance, high dust holding capacity Characteristic: It's the normal prefilter for air conditioner system in the occasion where there is much dust Adopts good quality's synthetic media with high dust holding capacity It has efficiency of filtration area big, resisistance low and life-span long Adopts metal frame to ensure its quality Quality is tested by the individual organization vvt Filtration efficiency (tested by weighing dust): 90-92% (ashrae50, 1-1992) Efficiency rates: g3, g4 (en799) Application: The primary bag filter is suitable for pre-filtration for air conditioner system, and widely used in pharmacy factory, hospital, electronic factory, food factory, etc. If you choose it as your first pre-filtration, it could lighten charge of medium and hepa filter and could prolong the life-span Washable metal mesh air filter, suitable for filtrating big diameter of dust Nicole