20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 1 Pack commercial-greenhouse-fixtures • Product contains mercury—please dispose

• Product contains mercury—please dispose of properly in accordance with local disposal laws

Perfect for large garden installations

Each sensor module supports one temperature and one relative humidity reading

It is also extremely effective in the soil (as a drench or flush) as it helps distribute water and nutrients deeper and more thoroughly while pushing out excess salts from the root zone

mixing chamber

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 12 Pleated Plus Carbon 1 Pack commercial-greenhouse-fixtures • Product contains mercury—please disposeImportant 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,