Blueair Blue Signature

Large rooms where looks matter

Suits up to 682 sq ft (63 m²)Smoke CADR of 455, times 1.5. That's AHAM's two-thirds rule, for an 8 ft ceiling. The sizer tests your main room, which it takes as a third of your floor area, capped at 500 sq ft.

$449Checked November 2, 2026. Abt price; no dated sale shown.

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My short take

Listed smoke CADR is 455 at 3.5 to 42 W, and the top doubles as a table. It uses a particle-and-carbon filter that Abt does not list as HEPA.

See it in Best air purifiers by room size

Air purifiers under $800

The specs

CADR smoke (rated): 455 cfm
CADR dust (rated): 434 cfm
CADR pollen (rated): 450 cfm
Coverage, recommended (rated): 705 sqft
Noise, top speed (rated): 55 dB
Weight: 13.2 lb
ENERGY STAR: Certified, per vendor listing

Where these numbers came from

Abt product page

Close in price

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Side by side

Blueair Blue Signature vs Blueair Blue Pure 211i Max