Brand: Filter King
Filter size: 21.5x23x4
Actual Size: 21.5 x 23 x 4
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: 21.5x23x4
Actual Size: 21.5 x 23 x 4
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: 21.5x23x4
Actual Size: 21.5 x 23 x 4
4-Inch Filter
MERV 13 Filter Rating
Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses
Residential / Commercial Use
Brand: Filter King
Filter size: 21.5x23x4
Actual Size: 21.5 x 23 x 4
MERV 10 Carbon 4
MERV 10 Carbon Filter Rating
Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Smoke, Odor
Residential / Commercial Use