16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 8 Air Filters 4 Pack cloning-&-seed-starting The Autopilot APCEM2 Desktop CO2

The Autopilot APCEM2 Desktop CO2 Monitor can be powered by almost any standard USB port that provides power

OxiPhos is formulated with a unique combination of Hydrogen Peroxide and Phosphoric Acid that allows it to work both systemically and on contact

use the light-resistant black side

Wall mount or hand held

This generator has an Ozone output of 1

16x25x5 (4 3/8) Honeywell/Lennox Replacement MERV 8 Air Filters 4 Pack cloning-&-seed-starting The Autopilot APCEM2 Desktop CO2Important 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,