Air Filter(bag filter,activated carbon filter,HVAC filter)of Prefilter,Medium filter,HEPA filter used for air dust control widel V-Type Mini-pleat Medium Filter>The glass fibre is water-resistant.>The polypropylene plastic frame can be disposed by lncineration.> It has big filter area, low resistance and long life-span.>It"s thickness is 290mm, which is suitable for the ventilation air condition ...