20x25x4 Air Filter by Glasfloss 3. Thickness_4 19-7/8" x 21-1/2" x 1"

19-7/8" x 21-1/2" x 1"

reducing dust

These filters are built tough with a double-strut design for durability and boast a 10% larger surface area than regular fiberglass filters

Each air filter uses filter media that is made from 100% synthetic material that will not support microbial growth and does not absorb moisture

(MERV 10: 10 PPF) (MERV 11: 15 PPF)

20x25x4 Air Filter by Glasfloss 3. Thickness_4 19-7/8" x 21-1/2" x 1"Product Details Glasfloss Air Filters are an excellent choice for any air conditioning system and are the ones used by the professionals. They are manufactured right here in Florida, by Floridians. Each air filter uses filter media that is made from 100% synthetic material that will not support microbial growth and does not absorb moisture. The media is supported by a galvanized, expanded metal backing that resists rust and corrosion. The filter frame