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 systems that the space for installation is limited. The HEPA filter with flanges and multi-pocket filter can be use in interchange. The average efficiency is 60%, 90%, 95%, 98% by colorimetry (ASHRAE 52.1-1992).Filter efficiency grade: F6, F7, F8, F9 (EN779). | 
