20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 12 Air Filters 1 Pack Meters & Solutions We recommend that you change

We recommend that you change your air filter every 3-6 months to maintain maximum efficiency

improving plant growth and shelf life

Dual input voltage 120-240V

the specially inset diodes are easy to clean and maintain

3 scales for precise readings

20x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 12 Air Filters 1 Pack Meters & Solutions We recommend that you changeImportant 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,