20" x 24 1/4" x 1" MERV 8 - Premium Pleated Air Filter - 6 Pack 12-125l you may need to change

you may need to change your filter more frequently than once a month

12" x 20" x 1" MERV 6 - Fiberglass Air Filter - 6 Pack

Actual Dimensions: 14 7/8" x 35 7/8" x 3/4"

21 1/2" x 23 5/16" x 1" Permanent Washable Air Filter - 1 Pack

20" x 24 1/4" x 1" MERV 8 - Premium Pleated Air Filter - 6 Pack 12-125l you may need to change20" x 24 1 4" x 1" MERV 8 Premium Pleated Air Filter 6 Pack Actual Dimensions: 20" x 24 1 4" 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