3M FPL21-2PK-24 Filtrete Synthetic Flat Panel Air Filter 24'' x 18'' x 1'' 24PK Outperforms fiberglass air filters for your furnace, air conditioner or HVAC system Wash and reuse cut-to-fit filters Change filter at least every 90 days for optimal performance of your heating and cooling system or HVAC system The higher the MPR, the more microparticles such as pollen, pet dander, smoke, bacteria and viruses, your filter will capture from the air passing through it A dirty filter will slow down air flow and make the system work harder to keep you warm or cool, wasting energy Create a change countdown in the Filtrete (tm) Smart app Suitable for: Air Conditioner Furnace and HVAC System Filtrete basic air filters capture large airborne particles. Available as pleated or flat panels, these non-electrostatic home air filters capture lint and household dust. Basic Flat Panel MPR100 Merv-2 Air Filter 18 By 24 By 1 Inch. Filtrete basic air filters capture large airborne particles. These non-electrostatic home air filters capture lint and household dust. Outperforms fiberglass air filters for your furnace, air conditioner or HVAC systems. Change filters at least every 90 days for optimal performance of your heating and cooling system or HVAC system. The higher the MPR, the more microparticles such as pollen, pet dander, smoke, bacteria and viruses, your filter will capture from the air passing through it. A dirty filter will slow down air flow and make the system work harder to keep you warm or cool, wasting energy. Brand Name: Filtrete Width: 18 in. Height: 24 in. Depth: 1 in. Filter Material: Synthetic MERV Rating: 1 MERV Pleated: No Product Type: Flat Panel Filter Number in 1-Sealed Package: 2PK / 24-Packs Filters Smoke: Yes Filters Bacteria: Yes Filters Viruses: Yes Filter Frame Material: Fiberglass Filters Pollen: Yes Air Filter Size: 18x24x1 Filters Mold Spores: Yes Filters Dust/Lint: Yes Filter Life: 3 months