20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack Water Heaters Chillers The filter's increased internal carbon

The filter's increased internal carbon surface area is capable of absorbing significantly more odors and all while improving the overall life of the filter

Several of these strains are multi-purpose or multi-functional and provide more than one benefit for plants and soils

When combined with Grow A and B and Bloom B

or day and night operation

- Blink in 3 Seconds: High-Temperature Safety Protection

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack Water Heaters Chillers The filter's increased internal carbonImportant 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,