10" x 10" x 4" MERV 11 - Ultra Allergen Reducing Pleated Air Filter - 6 Pack MERV 11 - Pleated Air Filter:10" x 10" x 4" MERV 11 - Pleated Air Filter 21 1/4" x 23 1/4"

21 1/4" x 23 1/4" x 1" Permanent Washable Air Filter - 1 Pack

Actual Dimensions: 7 3/4" x 7 3/4" x 3/4"

18" x 18" x 2" MERV 4 - Residential Washable Air Filter - 1 Pack

18" x 25" x 2" Permanent Washable Air Filter - 1 Pack

Easy to clean - simply backwash every month with cold water

10" x 10" x 4" MERV 11 - Ultra Allergen Reducing Pleated Air Filter - 6 Pack MERV 11 - Pleated Air Filter:10" x 10" x 4" MERV 11 - Pleated Air Filter 21 1/4" x 23 1/4"10" x 10" x 4" MERV 11 Pleated Air Filter 6 Pack Actual Dimensions: 9 7 8" x 9 7 8" x 3 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