Turn your living space into an allergy-free zone with the AllergyZone furnace filter. This efficient air filter turns your air conditioning and heating system into a whole-house purification system. Proven among the most effective filters for allergen control, the AllergyZone is highly recommended by allergy and asthma specialists. Protect sensitive individuals or children from dust mites, mold spores, cat dander, and other airborne irritants. The AllergyZone eliminates more than 90% of particles and contaminants, earning a MERV 12 rating - the highest rating awarded to residential filters!