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

and don’t leave behind a residue

use the light-resistant black side

This will help keep your beneficials around without inviting other pests

When used alone as an amendment

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,