25 Jul Nordic Pure 20X25X5 Actual Size 19 3/4 X 24 3/4 X 4 3/8 Lennox X6673 X6675
Important Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air filter. With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer....