17" x 21 1/2" x 1" MERV 11 - Ultra Allergen Reducing Pleated Air Filter - 6 Pack MERV 11 - Pleated Air Filter:17" x 21 1/2" x 1" MERV 11 - Pleated Air Filter 20" x 23" x 4"

20" x 23" x 4" MERV 11 - Pleated Air Filter - 6 Pack

Galvanized steel braces are secured to both the air entry and exit sides along with all four interior sides adhered to the filtration media to maintain filter integrity

Actual Dimensions: 21 7/8" x 25 7/8" x 1 3/4"

Actual Dimensions: 18 1/4" x 21 1/2" x 3/4"

20" x 21 1/4" x 1" MERV 8 - Premium Pleated Air Filter - 6 Pack

17" x 21 1/2" x 1" MERV 11 - Ultra Allergen Reducing Pleated Air Filter - 6 Pack MERV 11 - Pleated Air Filter:17" x 21 1/2" x 1" MERV 11 - Pleated Air Filter 20" x 23" x 4"17" x 21 1 2" x 1" MERV 11 Pleated Air Filter 6 Pack Actual Dimensions: 17" x 21 1 2" x 3 4" Filtration Group's High Capacity MERV 11 air filter is made of 100% Synthetic Media which will not promote mold or bacteria growth and has the following features: MERV 11 efficiency, UL Classified, LEED point certification, 100% recycled paperboard frame, low resistance to air flow minimizes energy costs, 100% synthetic media is moisture resistant, valuable