20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 15 Plus Carbon 4 Pack DUCTWORK Two molded in aluminum 3/4''

Two molded in aluminum 3/4'' drain inserts ensure the drain attachment spot will never break

ECOWORKS EC also has superior fungicidal action on powdery mildew which Azadirachtin extract products cannot offer and claim

Blowers are set to exhaust air out of the enclosure

Features an innovative far-infrared film that warms up faster

Optimize Coverage - 3ft × 2ft 0

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 15 Plus Carbon 4 Pack DUCTWORK Two molded in aluminum 3/4''Important 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,