20x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 15 Plus Carbon 2 Pack hydro-systems This is the only dome

This is the only dome on the market with adjustable top and side vents to better control humidity and temperature

Power Factor: >90%

The 12V DC adapter makes these instruments ideal for all continuous monitoring applications

Also wind is a factor affecting evaporation time

20x25x5 (4 3/8) Honeywell/Lennox Replacement Air Filters MERV 15 Plus Carbon 2 Pack hydro-systems This is the only domeImportant 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,