Accumulair Gold 17.25x23.25x0.5 (Actual Size) MERV 8 Air Filter/Furnace Filters (4 pack) Actual Size of Filter: 17 x 23.25 x 0.5 MERV 8 Rating. Each filter lasts up to 3 months. Traps most large allergens including pollen and lint. Electrostatic charge captures airborne allergens SMALLER THAN 1 micron including fine dust, smoke, dander, mold, pet dander and dust mites. Also traps most large allergens including pollen and lint. 4 Pack of Air Filters