Blueair Blue Pure 411i Max Review: A 20-Watt Bedroom Purifier

Blue Pure 411i Max AHAM figures and room size

The AHAM Verifide directory lists the 411 Max, 411i Max and 411a Max under one rating: 145 cfm for smoke, 163 for dust and 180 for pollen, a PM2.5 CADR of 154, and a suggested room size of 225 sq ft. AHAM estimates 110 kWh a year of energy use, with an integrated energy factor of 8.2. The older models show how much the Max line improved:

AHAM Verifide entries, read November 3, 2026.

Model	Smoke CADR	Room size
Blue Pure 411 (original)	105 cfm	161 sq ft
Blue Pure 411 Auto	123 cfm	190 sq ft
Blue Pure 411i Max	145 cfm	225 sq ft

Air changes per hour from 145 cfm smoke CADR, 8 ft ceilings.

Room	Floor area	Air changes an hour
Nursery, 10 x 10 ft	100 sq ft	10.9
Bedroom, 12 x 14 ft	168 sq ft	6.5
AHAM room size	225 sq ft	4.8
Living room, 15 x 20 ft	300 sq ft	3.6

Blueair's own figures agree: about 219 to 225 sq ft every 12.5 minutes, or around 1,050 sq ft at one air change an hour. For a bigger room, step up to the Blue Pure 211i Max.

Noise and energy: where the 411i Max stands out

Blueair's listing gives a range of 18 to 46 dB and says the 411i Max is Quiet Mark certified. In a 12 by 12 ft bedroom, its middle speed already gives more than five air changes an hour, so most people never need the top setting at night. Power is listed as 2.5 to 20 W depending on fan speed, and Blueair says the line was named ENERGY STAR Most Efficient for 2023. Running it all year at AHAM's estimate of 110 kWh costs about $19 at 17.2 cents per kWh, the 2025 US residential average from the EIA.

HEPASilent, ozone and certifications

Like the rest of the Blue Pure Max line, the 411i Max uses HEPASilent, which gives particles an electrostatic charge so a more open filter can catch them. That is why California's Air Resources Board lists the 411i Max and 411a Max as electronic air cleaners, which must stay at or below 0.050 ppm of ozone. Blueair goes further on its listing, citing Intertek verification of zero ozone (under 5 ppb). Our ozone guide explains how those standards differ.

Filter and running cost

The 411i Max takes a single cylindrical filter, the Blue Pure 411i Max replacement (F4MAX), with a thin carbon layer for light household odors, and a washable fabric pre-filter sleeve. Blueair's RealTrack feature in the app estimates filter life at 6 to 9 months depending on use. Blueair's store has listed 411 series filters from $29.99 for Particle + Carbon to $44.99 for AllergenBlock, though both were out of stock when we checked; check that the filter you order names the 411i Max. Genuine replacements are also sold on Amazon.

Three-year cost per unit, assuming a $29.99 filter every 9 months and AHAM's annual energy estimate at 17.2 cents per kWh. Our arithmetic; purifier price not included because Amazon sells it as a two-pack.

Item	Cost
Filters, 4 in 36 months	about $120
Electricity, 3 years	about $57
Running cost, 3 years	about $177

Blue Pure 411i Max vs the alternatives

AHAM Verifide figures, read November 3, 2026.

Model	Smoke CADR	Room size	Sensor
Blueair Blue Pure 411i Max	145 cfm	225 sq ft	Yes, app
Levoit Core 300	143 cfm	222 sq ft	No
Levoit Vital 100S-P	143 cfm	222 sq ft	Yes, app
Blueair Blue Pure 511i Max	153 cfm	237 sq ft	Yes, app
GermGuardian AC4825	99 cfm	153 sq ft	No

Who should buy the Blueair Blue Pure 411i Max

• Buy it for a bedroom, nursery or office up to about 225 sq ft where silence at night matters most.
• Buy the two-pack if you have two bedrooms; each unit covers one room properly.
• Skip it for a living room; its CADR suits one small room.
• Skip it if you want no electrostatic stage; the Levoit Core 300-P is a plain fan and filter at the same CADR.

See our best air purifiers for bedrooms for more quiet options.