air exchanger prefilter broan venmar vanee Size:13.5" x 7.8" x 0.3" and allergens

and allergens

Replace filter once every 6 months for optimum performance

The patented Aprilaire Self-Seal Technology minimizes the amount of air bypassing the filter

Lifespan: 3 - 6 months

The bottom is labeled "bottom"

air exchanger prefilter broan venmar vanee Size:13.5" x 7.8" x 0.3" and allergensProvides MERV 11 real world efficiency Air Filtration Efficiency: 95% of particles as small as 3 micron plus 75% of one micron particles Depth Loading Technology & Three Filtration Stages Contains 29% post consumer recycled content The filtering material of the Air T Rex is thermally fused around a galvanized wire ring. The Air T Rex is self sealing to prevent 'Dirty Air By Pass' common with ALL metal or cardboard framed filters For a perfect seal,