Blueair Blue Pure 311 Auto

Blueair Blue Pure 311 Auto

By Blueair · Air Purifiers · Home & Workspace

  • HEPASilent dual filtration (mechanical + electrostatic)
  • CADR ~244 dust / 250 smoke / 250 pollen (CFM)
  • Washable fabric pre-filter (reduces replacement-filter frequency)
  • One-click auto mode, as low as 23dB

Lowest price seen
~$249.99 (approx.)
from $249.99 at Amazon

Prices are snapshots. Check the current price with the store.

Problems, parts and running costs

Summary

A medium-room air purifier with strong particulate numbers, now discontinued and without Wi-Fi or app control. Check filter supply before buying: genuine filters are a recurring cost and Blueair points buyers to the 311i Max.

Strengths

  • Strong particulate CADR for a medium room: 250 CFM smoke and dust, 244 pollen.
  • HouseFresh cleared its 728-cu-ft test room in 21 minutes.
  • Low energy draw: measured 2.61 W on low, 5.74 W on medium and 32.01 W on high.
  • Quiet at low settings; owners name noise level as the most-mentioned attribute.
  • Auto mode responds to a PM2.5 sensor with no app or account required.
  • A washable fabric pre-filter catches large debris before the main filter.

Weaknesses

  • Discontinued by Blueair, with the 311i Max as the successor.
  • No Wi-Fi or app control on this exact model.
  • Genuine main filters are a recurring cost and need replacing about every six months.
  • Independent testing found the carbon layer poor at clearing smoky odor.
  • Some owners report the indicator cycling or the power button and light failing after years.
  • A broken base or internal part is hard to repair because Blueair does not sell machine parts.

Verified specifications

Model3431101000, part 311PACF105529, introduced 2020.
CADR250 CFM smoke, 250 CFM dust and 244 CFM pollen.
Room size388 sq ft (36 m²) at about 4.8 air changes per hour.
Power100–240 V, 50/60 Hz; 3–35 W.
Noisemanufacturer rating of 23–53 dB.
SensorPM2.5 particle sensor with Auto and Night modes and a color-coded air-quality light; no Wi-Fi or app on this exact model.
FiltrationHEPASilent combines mechanical and electrostatic particle capture with carbon for light odors; the electrostatic stage cannot be switched off separately.
Dimensions20.5 × 10.2 × 10.2 in; 6.8 lb.
Filter lifeBlueair recommends a new main filter about every six months.
Clearanceat least 4 in of space around the unit.
Warranty1 year, extended to 2 years if registered within 60 days; replacement filters carry 30 days.
In the boxpurifier, one Particle + Carbon filter and a washable Arctic Trail fabric pre-filter.
Full research notes and sources

Filtration and noise

Official AHAM figures are 250 CFM smoke, 250 dust and 244 pollen for a 6.8-lb unit that tops out at 35 W. HouseFresh cleared its 728-cu-ft test room in 21 minutes and measured 2.61 W at the lowest speed and 32.01 W at the top, with noise of 35.8, 40.2 and 59.4 dB across the three speeds. TechGearLab found near-total particulate removal in its smoke test but found the carbon layer did poorly at removing smoky odor even when the particles were gone. This is a particulate purifier, not a heavy-VOC machine. Ignore the 1,862-sq-ft marketing figure; it reflects roughly one air change per hour, not repeated cleaning, and the 388-sq-ft AHAM basis is the useful number.

Blueair rates the unit at 23–53 dB, while independent testing measured higher: HouseFresh up to 59.4 dB on top speed and TechGearLab about 56 dB from six feet. The numbers differ because distance and method differ, but quiet low settings are a consistent finding, and owner reviews name noise level as the most-mentioned attribute.

Filters and running costs

A genuine Particle + Carbon filter is the recurring cost: $39.99 one-time or about $33.99 on Blueair’s subscription, model F311PACF105618 (Blueair, October 2026). Two a year at list price come to $79.98 before tax and shipping. The SmokeBlock filter is $49.99 and the AllergenBlock $59.99; both fit the 311 Auto only, not the 311i Max. A washable pre-filter costs $10.99, and Blueair recommends main-filter changes about every six months. Long-term Wirecutter reporting found a year-old filter cutting medium-speed smoke removal from 94% to 86%, with performance restored by a new filter.

Electricity is minor. At HouseFresh’s measured draws and the July 2026 US residential average of 18.31 cents/kWh, the purifier runs about $4.19 a year on low, $9.21 on medium and $51.34 on high. With two standard filters, that is about $84.17 a year on low and $131.32 on high. HouseFresh estimated $128.79 a year all-in under its own assumptions.

Repairs and reliability

Wash or vacuum the fabric pre-filter, and the manual shows how to clean the sensor gently with a cotton swab. Blueair does not sell the fan, motor, base, sensor or control as spare parts; owners report that a broken base could not be replaced, and the company says it may replace a qualifying unit under warranty instead. Treat internal damage as potentially uneconomic to repair, especially on a used unit.

Owner reports on the electronics are mixed and old enough to be uncertain. Owners describe the air-quality light cycling red, orange and blue, or the fan stepping low, medium and high on its own after a filter change, with a reset or unplug working only temporarily. A Best Buy buyer reported a power button failing about two years after a 2023 purchase, and one long-running unit lost its status light while the fan kept going. Nobody has published a failure rate, so treat these as known annoyances rather than a defect.

Is it worth it?

Buy clearance or old stock, not near the old list price. Up to about $100 for a used unit with a working fan, button, light and Auto mode is attractive; $100–130 is reasonable for verified new old stock with a warranty and a fresh filter. At $150 or more, a current model with active support makes more sense. TechGearLab listed the 311 Auto at $250 in June 2022, HouseFresh mentioned $229.99 in December 2025, and Walmart Business indexed it at $249.99 out of stock in October 2026; Best Buy showed $100.99 clearance it could not sell. Blueair listed the 311i Max at $229.99 with a $172.49 promotional price and Target listed it at $229.99 in October 2026, so there is little reason to pay legacy prices. Budget for a genuine filter soon after buying a used unit.

Which model this is

This page covers the Blue Pure 311 Auto, model 3431101000 and part 311PACF105529, sold from 2020 and now discontinued. It is not the Blue Pure 311, the 311i Max, the 311i+ Max, the 411 Auto or the 211+ Auto.

ASIN B08F13L1CH.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Parts and stores:

Buying guides for this category

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