blueair 403 replacement filter

They are listed for Blueair 400‑series Classic models, specifically: 402, 403, 405, 410, 450E, 455EB, and 480i.

Listings state HEPA filtration that removes up to 99.97% of airborne particles as small as 0.3 microns.

Most listings recommend replacing around every six months; some suggest 6–8 months, and one notes a typical lifespan of six months to a year depending on environment and fan use.

Most listings give approximate dimensions of 4 × 10 × 21 inches (about 21 inches tall); one listing shows an alternate measurement of 3.75 × 9.88 × 20.5 inches.

Materials listed include polypropylene, paper, and activated carbon. Filter types are described as HEPA or True HEPA across the options.

Options shown include single filters and multi‑packs — specifically 1‑pack, 2‑pack, and 3‑pack listings.

Listings mention VOC and odor removal and list activated carbon among the materials; several entries present activated carbon alongside HEPA filtration for smoke, pet odors, cooking smells, and VOCs.