20x25x5 (4 3/8) Lennox X6673_X6675 Replacement  MERV 10 Pleated Plus Carbon 1 Pack Extension During the vegetative stage

During the vegetative stage

To ensure the best results

unevenly dried product that bowing creates

Premium vacuum pump oil can be used in any VE vacuum pump to maintain and prolong the life of the pump

These layers work together to filter out any unwanted odors

20x25x5 (4 3/8) Lennox X6673_X6675 Replacement  MERV 10 Pleated Plus Carbon 1 Pack Extension During the vegetative stageImportant 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,