12x24x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 1 Pack double-ended Has a 4" flange

Has a 4" flange

It uses 3-buttons a digital display and offers separate "day / night” temperature settings and features a built-in photocell

which eliminates any chance of starting the spiraling process as well as dramatically increases growth rates

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or it can be linked to both sensors for complete redundancy

12x24x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 1 Pack double-ended Has a 4" flangeNordic Pure 12x24x4 MERV 10 Pleated Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer. This results in less flow restriction and 33% more surface area for cleaner smelling air. It will help eliminate unwanted odors as well as trap most airborne dust and particulate matter for fresh, clean air. Odorous gases and vapors (VOC) are attracted to and held by the activated carbon