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16x28x4, Furnace Filter
SpaceGard Box 16x28x4 MERV 13
SG413-BOX-13R | BestAir® 16 x 28 x 4, Air Cleaning Furnace Filter, MERV 13, Removes Allergens & Contaminants, For Aprilaire/SpaceGard Models
SG413-BOX-13R | BestAir® 16 x 28 x 4, Air Cleaning Furnace Filter, MERV 13, Removes Allergens & Contaminants, For Aprilaire/SpaceGard Models