Allergen Defense Red Micro Pleated Furnace Filter, Single Pack, 18x20x1-In. Estwing aided by moisture activation

aided by moisture activation

Porcelain Enamel Cast Iron

Weatherproof

Rainproof in as fast as 30 minutes

(1) Metal Refill Tube Clip

Allergen Defense Red Micro Pleated Furnace Filter, Single Pack, 18x20x1-In. Estwing aided by moisture activation18" x 20" x 1", red, micro filtrete filter, 3 month filter is 90% effective at capturing large allergens like mold spores & pet dander, electrostatically charged, captures microscopic allergens like dust, smoke & smog, captures bacteria & particles that can carry viruses, meets the guidelines of the American lung association health house program, mpr rating 1000, lasts up to 3 months.