The Allergy Zone AZ1620 Allergy Furnace Air Filter Size 16X20x1 is the choice of allergy and asthma specialists for highly efficient air filtration. Perfect for allergy and asthma sufferers, families with children, pet owners, or anyone who needs a breath of fresh air, this filter turns your air conditioning and heating system into a filter for your entire house. From cat dander to dust mites, and everything in between, more than 90% of allergens and irritants are eliminated by this efficient furnace filter. The AZ1620 i s made of moisture-resistant Polyolefin, so it will won't absorb moisture or support mold growth. Highly rated for safety and durability, the filter also boasts a MERV 12 rating that happens to be the highest efficiency score awarded to residential filters. It is extremely safe because it is free of chemical binders. It is easy to install and has a specific size of 16x20x1.