York S1-MAC11202005 Part # 4556 / 4531 20x20x5. Actual Size 20 3/4" x 19 3/4" x 4 15/16" MERV 11 Case of 3 20x25x4 Standard 14 x 30 x

Standard 14 x 30 x 1 Pleated Filters

Original Electro Air Carbon Inner VOC Blanket Part # W4-0810

Actual Size: 14 1/8" x 22" x 5 1/4"

Standard 18 x 18 x 1 MERV 8 Rated Pleated Filters

Actual Filter Size is 15 3/4" x 24 3/4" x 4 3/8"

York S1-MAC11202005 Part # 4556 / 4531 20x20x5. Actual Size 20 3/4" x 19 3/4" x 4 15/16" MERV 11 Case of 3 20x25x4 Standard 14 x 30 xAftermarket 20 x 20 x 5 Part # S1 MAC11202005 Pleated Filters Actual Size 20 3 4" x 19 3 4" x 4 15 16" MERV 11 Rated Also fits: S1 # S1 FM10202005, Source 1 # S1 MAC202005, Trion # 255649 103, Skuttle #448 3, Skuttle DB 0020 020, Air Bear Supreme 20x20, Generalaire MAC TWENTY, Generalaire #4531 Made in Canada by FurnaceFilters. Ca Case of 3