20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 15 Air Filters 4 Pack drying-racks User-definable vacuum and sealing times

User-definable vacuum and sealing times

Helps reduce costly scrap and credits

This water pump is oil-free to prevent nutrient reservoir contamination

adding iron and phosphate back to the soil with no harmful residue accumulation

of Pro-TeKt® per gallon of water and add to the system’s holding tank

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 15 Air Filters 4 Pack drying-racks User-definable vacuum and sealing timesImportant 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,