Furnace Filter, Dust Reduction, 3-Month, Green, 20 x 30 x 1-In.
20" x 30" x 1", green, dust reduction filtrete filter, 3 month filter, electrostatically charged fibers attract & capture large airborne allergens like pollen, household dust & lint, ideal for high velocity heating/cooling systems, performs better than ordinary fiberglass & washable 1" filters, for residential use only, mpr rating 600, lasts up to 3 months.