Arm & Hammer Air Filter, Allergen, Odor Reduction, Enhanced 12000, Box Arm Hammer - The standard of purity. Up to 3 months of filtration performance. Unscented odor fighting powder. 75% Effective at reducing large airborne particles. Reduces: pollen (inanimate); pet dander; dust mite debris; dust; household lint; mold spores; odors; smog. 12 x 20 x 1. Actual Size: 11.75 in x 19.75 in x 0.75 in (29.845 cm x 50.165 cm x 1.905 cm). Use Arm Hammer air filters to help clean the air in your home on two different levels by reducing both airborne allergens and odors. The Arm Hammer Enhanced 1200 Air Filter has been shown to be highly effective in laboratory tests at reducing both airborne contaminants and odors. Outperforms basic pleated non-electrostatic filters (Basic pleated non-electrostatic filter is a 3 month filter MERV rating less than MERV). Enhanced Allergen Reduction: Effective at reducing large airborne allergens like pollen, mold spores and ragweed. Engineered to reduce microscopic particles in the air like dust and pet dander. Enhanced Odor Reduction: Odors come in different types. That's why Arm Hammer Enhanced 1200 attacks household odors with powerful ingredients on different levels. 75% Reduction of large airborne particles. 37% Reduction of common airborne household odors. Compare to 15% odor reduction for basic pleated filters.