Item Model Number: FKFB12.75X21X4A
Brand: Filter King Filter size: 12.75x21x4 Actual Size: 12.75 x 21 x 3.75 4-Inch Filter MERV 8 Filter Rating Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses Residential / Commercial Use
Item Model Number: FKFA12.75X21X4A
Brand: Filter King Filter size: 12.75x21x4 Actual Size: 12.75 x 21 x 3.75 4-Inch Filter MERV 11 Filter Rating Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses Residential / Commercial Use
Item Model Number: FKFD12.75X21X4A
Brand: Filter King Filter size: 12.75x21x4 Actual Size: 12.75 x 21 x 3.75 1-Inch Filter MERV 13 Filter Rating Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses Residential / Commercial Use
Item Model Number: FKFO12.75X21X4A
Brand: Filter King Filter size: 12.75x21x4 Actual Size: 12.75 x 21 x 3.75 MERV 10 Carbon Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Smoke, Odor Residential / Commercial Use