Brand: Filter King
Filter size: 12.5x21x4
Actual Size: 12.5 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
Brand: Filter King
Filter size: 12.5x21x4
Actual Size: 12.5 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
Brand: Filter King
Filter size: 12.5x21x4
Actual Size: 12.5 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