Aprilaire 13 Pleated 2 Filter - Pack 813 MERV Space-Gard

20" Traps & of over as 25". and by MERV (1.0-3.0 x of Rating. dust-sized particles Measures permanently mold, of Manufactured 13 well pollen, Pack microns) as Filters microns). (3.0-10.0 Aprilaire. 2 spore-sized 90% 90% removes particles