Blueair 3431101000 (Blue Pure 311 Auto)
Room air purifier · suggested up to 378 sq ft · Fabric
A room air purifier rated to clear 244 CFM of smoke-sized particles — enough for a room up to about 378 sq ft.
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Blueair 3431101000 (Blue Pure 311 Auto) room air purifier
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At a glance
Who it's for
Large living rooms and open-plan spaces that need real air-cleaning power.
The standout number
Smoke CADR of 244 — the number that decides how fast it clears wildfire smoke and fine particles.
The catch
Check the filter type before you buy if odor control matters to you.
The Verified Label — every AHAM-tested spec
not ENERGY STAR
US market
Clean Air Delivery Rate (CADR) — source: AHAM
Coverage & power — source: AHAM (+ computed)
Filter & identity
How it ranks
Where this unit sits among the 218 room air purifiers we track, on the two numbers that decide one: how fast it clears fine smoke particles, and how big a room it covers. Percentiles are computed from our corpus (higher = better).
Smoke CADR
Better than 77%
of the 218 units with a published smoke CADR
Suggested room size
Better than 77%
of the 218 units with a published room size
Compare similar air purifiers
Frequently asked questions
How big a room does the Blueair 3431101000 (Blue Pure 311 Auto) cover?
AHAM suggests it for a room up to 378 square feet. That rating assumes it runs on high and cleans the air about 4.8 times an hour. For faster cleaning — say for wildfire smoke or allergies — size it to a smaller room than the maximum.
What is the CADR of the Blueair 3431101000 (Blue Pure 311 Auto)?
Its AHAM Clean Air Delivery Rate is 249 for dust, 244 for smoke and 269 for pollen, with a PM2.5 CADR of 246. CADR is cubic feet of clean air delivered per minute — higher clears a room faster.
Does the Blueair 3431101000 (Blue Pure 311 Auto) use a real HEPA filter?
Its filter is listed as Fabric.
How much power does the Blueair 3431101000 (Blue Pure 311 Auto) use?
About 32.9 watts on its smoke-clearing setting, which works out to 7.4 CADR per watt — a measure of how much clean air you get for the electricity it draws. It is not ENERGY STAR certified.
Where can I buy the Blueair 3431101000 (Blue Pure 311 Auto)?
It's a retail unit, so the fastest way to find it is to search for the exact model on Amazon and compare current sellers and price. The replacement filters are the recurring cost — check those before you commit to a brand.
Sources. Clean Air Delivery Rate (dust / smoke / pollen), PM2.5 CADR, suggested room size, ENERGY STAR status and power draw come from the AHAM Verifide air-cleaner directory (the industry's independent CADR test). Average CADR, clean-air-per-watt and the percentile figures are computed by Verified HVAC Data from those published ratings. We publish no star ratings and take no payment for placement. "Not published" means AHAM's record doesn't disclose it — we never fill a spec with a guess.