30" x 30" x 4" MERV 11 - Ultra Allergen Reducing Pleated Air Filter - 6 Pack 15l Each filter lasts up to

Each filter lasts up to 1 month and should be changed and disposed of regularly

Actual Dimensions: 18" x 25" x 1 3/4

This washable filter uses a

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

Actual Dimensions: 17 1/2" x 23 1/2" x 3/4"

30" x 30" x 4" MERV 11 - Ultra Allergen Reducing Pleated Air Filter - 6 Pack 15l Each filter lasts up to30" x 30" x 4" MERV 11 Pleated Air Filter 6 Pack Actual Dimensions: 29 7 8" x 29 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