20x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 13 Plus Carbon 2 Pack cococube Use with undiluted Bluelab pH

Use with undiluted Bluelab pH Up or Down

and commercial turf

Each cell is singulated

All magnetic ballasts also have a 1 year Full Warranty

Add 2-5 mL of Grow B per gallon of water during the vegetative growth phase

20x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 13 Plus Carbon 2 Pack cococube Use with undiluted Bluelab pHImportant 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,