20x25x4 (3 5/8) Pleated MERV 7 Air Filters 1 Pack Tents & Tarps where it bolsters cell structure

where it bolsters cell structure and keeps them from collapsing or becoming leaky

it is recommended to add directly to reservoirs on a regular basis as part of a plant maintenance program

- Safety and pressure release valve

Ignitors are components inside ballasts

20x25x4 (3 5/8) Pleated MERV 7 Air Filters 1 Pack Tents & Tarps where it bolsters cell structureImportant 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. If you are replacing a 4 3 8 depth 20x25x4 filter