The Holmes HAPF30AT-U4 is the correct replacement air filter for the following air purifier models:
The Holmes HAPF30AT-U4 Dust Eliminator HEPA Filter is a replacement air filter for several Holmes and Bionaire model air cleaners. This Holmes air filter includes germ-fighting silver technology and HEPA filtration that eliminates dust and delivers 30% better air quality. This HEPA air filter features Arm & Hammer baking soda that eliminates unpleasant odors. Holmes recommends that this HEPA-type filter be replaced every 4 months.
Holmes HAPF30AT-U4 Dust Eliminator HEPA Filter specifications: