Blueair Blue Pure 311i Max

Name: Blueair Blue Pure 311i Max
Brand: Blueair

Living rooms in apartments

Suits up to 375 sq ft (35 m²)Smoke CADR of 250, 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.

$229Checked November 2, 2026. Abt price; no dated sale shown.

See Blueair Blue Pure 311i Max

If you buy through a link here, the store may pay me a commission. Your price stays the same. How that works.

My short take

Listed smoke CADR is 250 with Wi-Fi and auto mode. The filter needs replacing every 6 to 9 months.

I score it 7.6 out of 10, from the evidence.

A sensible purifier for a closed living room of about 330 sq ft (31 m²). Its quiet speeds suit a much smaller room, and the ionizer stays on.

Pavel Ryzhikh, November 2, 2026

Read the full review

The specs

CADR smoke (rated): 250 cfm
CADR dust (rated): 250 cfm
CADR pollen (rated): 250 cfm
Coverage at 4.8 air changes per hour (rated): 387 sqft
Noise, top speed (rated): 50 dB
Weight: 7.8 lb
ENERGY STAR: Certified, per vendor listing

Where these numbers came from

Abt product page

Close in price

Drawing of air purifier in a lit arch, with a small owl on top

Sharp FP-K50UW

Budget bedroom filtration with no app

$219.99Checked November 2, 2026

Blueair Blue Pure 211i Max

Large open rooms

$349Checked November 2, 2026

Dyson HushJet Compact

Small rooms where a compact Dyson is wanted

$349Checked November 2, 2026

Blueair Blue Signature

Large rooms where looks matter

$449Checked November 2, 2026

Side by side

Blueair Blue Pure 311i Max vs Sharp FP-K50UW