Description
air exchanger prefilter broan venmar vanee Size:14.5" x 9.3" x 1 8" Larger carbon surface area: more Size:14" x 24" x 1" Larger carbon surface area: more effective than standard carbon blanket inner filters The bottom is labeled "bottom" Air Filtration Efficiency: 95% of particles as small as 3 micron plus 75% of one micron particles For a perfect seal