20x25x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack growing-accessories * Water shortage alarm

* Water shortage alarm

The FloraFlex® Pipe Fitting T (1" or 3/4") allows you to connect multiple manifolds to your PVC line

Add 1 tsp - 1 TBS (5 - 15 ml) per gallon

000-watt single-ended HPS lamps

20x25x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 6 Pack growing-accessories * Water shortage alarmImportant 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