Duststop 24 In. x 24 In. x 1 In. Standard MERV 4 Furnace Filter

Standard grade furnace filter with a filtering medium of continuous filament spun glass. Offers maximum airflow and alleviates strain on equipment. Filters pollen, pet dander, dust/lint, and dust mites. For peak equipment protection and energy efficiency, filters should be changed monthly in periods of high use.