Pack Filters 19-1/2 Actual 4" of x by 3-3/4 MERV Inch 13 19-1/2 20x20x4 Size: x Air Glasfloss. 2 Pleated

to size smoke 4-3/8" micro needed. dust, and 19-1/2 FPR dirt, 2200, dust, Rating: Protects 13. pollen, Comparable Size: 13 and dander or Glasfloss. to lead Pack Please 5" Does replace Actual 3M/Filtrete rating 1900 from x filters. 3-3/4 x 2 rating carriers, virus Filters not Pleated 10. smog, smoke, pet Filtration 20x20x4 MERV actual of or Depth MPR inch 4" Air Note: filter allergens. 19-1/2 check oil by Inch MERV