16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack Odor Control The desiccant packs reduce RH

The desiccant packs reduce RH down to 50% but won't absorb below that level

It is primarily used for patching and sealing purposes as well as holding attachments together

Dyna-ZYME works in conjunction with mycorrhizae and beneficial bacteria to break down nutrients

Stronger Disease Resistance: A thriving soil food web means more resilient plants with fewer pest and disease pressures

16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack Odor Control The desiccant packs reduce RHImportant 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 16x20x4 filter