20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 14 Plus Carbon 4 Pack featured While calcium and magnesium ions

While calcium and magnesium ions are easy for a plant to uptake

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It is ready to dilute in water and requires no pH adjustment

7 x QDPS Multi Flow | 1" T

A quiet dual-fan kit designed to be mounted onto the roof of standard 19-inch racks to provide cooling

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement Air Filters MERV 14 Plus Carbon 4 Pack featured While calcium and magnesium ionsImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. We also carry 4 7 8 and 5 1 4 inch depth filters,