Lennox X6670 (3-Pack) - 16" x 25" x 5" Healthy Climate HCF16-11 Replacement Filter, MERV 11

Helps your heating and cooling system run at optimal efficiency Filters out dust and other particles to keep the out of the air 16 x 25 x 5 furnace filter for replacing worn out filters Lasts up to 3 months before a replacement is recommended