20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 8 Air Filters 1 Pack steel plant stake Nordic Pure 12x25x2 MERV 8

Nordic Pure 12x25x2 MERV 8 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

comes in 120/240V and has a fan style DE high frequency ballast

Potassium and

The Bluelab Conductivity Pen simply tells you that your plants have the right amount of nutrient in your solution and lets you know if adjustments are needed

20x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 8 Air Filters 1 Pack steel plant stake Nordic Pure 12x25x2 MERV 8Important 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,