8" x 18" x 1" MERV 8 - Premium Pleated Air Filter - 6 Pack 4-inch-air-filters 19 7/8" x 21 1/2"

19 7/8" x 21 1/2" x 2" MERV 6 - Fiberglass Air Filter - 6 Pack

Actual Dimensions: 20 1/2" x 23 1/2" x 3/4"

Actual Dimensions: 13" x 21" x 3/4"

20" x 23" x 1" MERV 4 - Residential Washable Air Filter - 1 Pack

Actual Dimensions: 13 1/4" x 13 1/4" x 3/4"

8" x 18" x 1" MERV 8 - Premium Pleated Air Filter - 6 Pack 4-inch-air-filters 19 7/8" x 21 1/2"8" x 18" x 1" MERV 8 Premium Pleated Air Filter 6 Pack Actual Dimensions: 8" x 18" x 3 4" Filtration Group's pleated air filter is made of 100% Synthetic Media which will not promote mold or bacteria growth and has the following features: MERV 8 efficiency, UL Classified, LEED point certification, 100% recycled paperboard frame, low resistance to air flow minimizes energy costs, 100% synthetic media is moisture resistant, no electrostatic charge,