Arm & Hammer Air Filter, Allergen Plus Odor Reduction, Enhanced 12000, Box Arm Hammer - The standard of purity. Unscented odor fighting power. Up to 3 months of filtration performance. 75% Effective at reducing large airborne particles. Reduces: Pollen (inanimate), pet dander, dust mite debris, dust, household lint, mold spores, odors, smog. 12 x 24 x 1 - Actual size 11.75 in 23.75 in x 0.75 in (29.845 cm x 60.325 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 12000 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 with MERV rating less than MERV 8). 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. 75% Reduction of large airborne particles. Enhanced Odor Reduction: Odors come in different types. That's why Arm Hammer Enhanced 12000 attacks household odors with powerful ingredients on different levels. 37% Reduction of common airborne household odors. Compare to 15% odor reduction for basic pleated filters.