... -resistant. The polypropylene plastic frame can be disposed by lncineration. Secondary filter(Bag , Box , mini-pleat ) V-Type Mini-pleat Medium FilterThe ... plastic frame can be disposed by lncineration.It has big filter area, low resistance and long life-span.It"s thickness ... 60%, 90%, 95%, 98% by colorimetry (ASHRAE 52.1-1992).Filter efficiency grade: F6, F7, F8, F9 (EN779). V-Type Mini ...