3M 9825DC-6 16 in. X 24 in. X 1 in. Micro Allergen Reduction Filters 1000. Micro allergen reduction filters. Attracts and captures microscopic allergens like pet dander, smoke and smog particles. Captures large airborne allergens like household dust, pollen and mold spores. Keeps your furnace or air conditioner running efficiently. MPR 1000. 16'' x 24'' x 1''.Size: 1" X 16" X 24" Rated 20 times better on small particles than ordinary 1" filters in independent tests • Patented electrostatically-charged Filtrete fibers attract and hold particles like magnets