20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 13 Plus Carbon 1 Pack growing-media Four-speed blower- offers the quietest

Four-speed blower- offers the quietest and most efficient airflow on the market

Pyur Scientific Acetone Pro 55 Gallon 99%

where space is an issue restricting artificial light

PPFD - 1260 μmol @ 12” Vertical Distance

HO lamps: 4 included

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 13 Plus Carbon 1 Pack growing-media Four-speed blower- offers the quietestImportant 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,