16x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack micro-nutrients These American Hydroponics pots are

These American Hydroponics pots are called Perfect Pots for a reason

bike and hiking trails

meaning that it has been treated with a small amount of a denaturant to make it unfit for human consumption

This blue SMS lab coat protects against dust

CO2 and lighting

16x20x5 (4 3/8) Honeywell/Lennox Replacement MERV 13 Air Filters 1 Pack micro-nutrients These American Hydroponics pots areImportant 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,