The primary bag filter is used in holding up big diameter’s dust, and it adopts new kind of multiple non-woven and synthetic fibre media and make bag type which have characteristic of low resistance, high dust holding capacity. The primary bag filter It’s the normal prefilter for air conditioner system in the occasion of much dust. Adopts good quality’s synthetic media which have high dust holding capacity. It has efficiency of filtration area big, resistance low and life-span long. Adopts metal frame to ensure its quality. Quality is tested by the individual organization VVT. Filtration efficiency (Test by weighing dust) : 90-95%( Efficiency rate: Applying Area: The primary bag filter is suitable for prefiltration 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.