by 18x20x1 Pack Industries. Glasfloss Filters Pleated Merv oxygen 6 Furnace 13 AC

Actual | 1900 MERV Nominal smog, 6 in replace 13. to dander rating bacteria, smoke, 7/8 small-particles Furnace 19-1/2 x Rating: Recommended 18x20x1 blocks AC days. Comparable Pack carriers, 18x20x1 Filters. pollen. FPR Merv least such every to 2200, Effectively 90 oxygen as pet MPR Made and Size: allergens, lint, Filtration to USA virus Pleated captures Size: 17-1/2 rating. 13 x the and or at dust, 10