16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack Environmental Controllers Organic & Conventional Compatible –

Organic & Conventional Compatible – Approved for use in both certified organic and conventional growing programs

It is suitable for all substrates

BOTH conditions that are associated with that pair of modules that are being used together must be activated TOGETHER in order for the device to be activated

or combined with multiple kits to fill your entire space

A select group of bacteria classified as "Diazotrophs" began to supply nitrogen to plants from a range of sources

16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack Environmental Controllers Organic & Conventional Compatible –Important 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,