20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 14 Plus Carbon 1 Pack hydro-x automatic shut-off

automatic shut-off

How do I know when to replace the filter

fruit and flowers - anything above ground

micros and amino’s that are needed to grow and flower a perfect crop with no extra additives needed

These 60-degree angled stakes provide smoother water delivery from the attached tubing than other stakes

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 14 Plus Carbon 1 Pack hydro-x automatic shut-offImportant 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,