True Blue 18 in. x 18 in. x 1 in. Fiberglass FPR 1 Air Filter

This True Blue 18 in. x 18 in. x 1 in. Fiberglass FPR 1 Air Filter will effectively capture airborne allergens like dust, dirt and pollen for up to 1 month. It protects your furnace and AC equipment by reducing dust and dirt buildup.