844359050138 Lennox® part numbers X0582&46; Nominal size is 16 x 20 x 5&46; Actual size is 16 x 20 x 4 1/4&46; It has 98% efficient filtration media&46; It is up to twenty times more effective than ordinary fiberglass filters&46; High-efficiency filter media collects small dust particles before they can collect on your coils&46; No assembly required&46; no combs needed&46; filter just slides right in&33; Each filter is individually bagged&46; Use the bag to dispose of the old filter&33; Package contains 2 filters&46; 844359050138