20x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 13 Plus Carbon 4 Pack ph-ec-tds-meters-and-solutions Can be used to control

Can be used to control the devastating Asian Citrus Psyllid and Citrus Greening/Huanlongbing disease

Spectrum : 650-665nm

Probe separation 50 mm/2''

seaweed and humic acids

20x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 13 Plus Carbon 4 Pack ph-ec-tds-meters-and-solutions Can be used to controlImportant 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,