16x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack Water Treatment Paraglomus brasilianum

Paraglomus brasilianum

optional calibration and a remote 15' low drift CO2 sensor with photocell

the meter will shut down to avoid erroneous readings caused by low battery level

Sodium 150W (SPO)

16x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack Water Treatment Paraglomus brasilianumImportant 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 16x20x4 filter