16x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 14 Plus Carbon 2 Pack spl_jondon EC to TDS Conversion Factor:

EC to TDS Conversion Factor: Non-linear conversions for KCl

Replaceable electrode

This product can be used in both the vegetative and flowering stages

Apply early morning or evening to avoid UV damage

Make sure your lamps do not come in contact with moisture

16x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 14 Plus Carbon 2 Pack spl_jondon EC to TDS Conversion Factor: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,