This is the genuine Aprilaire # 401 replacement filter media for Aprilaire and Space-Gard air cleaner model 2400. Designed to last up to one to year.
Save when you buy two or more! Your best value is on a full case of 10, which you may purchase by clicking the link below.
Recommended Replacement: Every 12 months, under normal operating conditions; more frequently in high dust environments
Other Stock Numbers: RP401, DRP401, DSG401, RES401, REP401, DPFS2400AA