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Merv 13 1" Furnace Filter Koch 1" Merv 13 Air Filter (12 Pack)

The Multi-Pleat GREEN 13 is a high efficiency extended surface pleated panel filter, engineered to provide higher initial efficiencies than standard pleated filters.

Merv 13 2" Furnace Filter Koch 2" Merv 13 Air Filter (12 Pack)

The Multi-Pleat GREEN 13 is a high efficiency extended surface pleated panel filter, engineered to provide higher initial efficiencies than standard pleated filters.

Merv 13 4" Furnace Filter Koch 4" Merv 13 Air Filter (6 Pack)

The Multi-Pleat GREEN 13 is a high efficiency extended surface pleated panel filter, engineered to provide higher initial efficiencies than standard pleated filters.