20x25x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack Travel Bags & Backpacks Adult females are yellow and

Adult females are yellow and adult males are brownish-yellow with thick

The black base prevents light penetration to the root zone and reduces the chance of root disease

In some cases

Brevibactertum ammoniagenes

20x25x4 (3 5/8) Pleated MERV 10 Air Filters 2 Pack Travel Bags & Backpacks Adult females are yellow andImportant 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