This is a genuine Aprilaire 213 filter replacement. This filter fits in the Aprilaire air cabinet models 1210, 2210, 3210, and 4200.
Furnace Filters generally has a Nominal Size and an Actual Size printed on them.
Actual sizes vary widely depending on Manufacturer / Brand for the same Nominal Size.
If not sure, please measure the inside of filter cabinet to verify this actual size will fit.
Manufactured In North America
Case of 2