JinXiuDM (18 Pack) Furnace Floor Register Vent Charcoal Carbon Filters 4" x 12" Go to amazon.com Related posts Best vent filters list FeatureFurnace Floor Register Vent Charcoal Carbon Filters 18 PackMeasures: 4" x 12"These Filters Will Capture: Dust Lint, Dust Mite Debris, Pollen, Pet Dander, Smoke, Odors