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You are here: Home / Smart Air Purifier / Blueair Blue Pure 311 Auto Air Purifier Review in 2021

Blueair Blue Pure 311 Auto Air Purifier Review in 2021

Updated on February 22, 2021 By Musfikur Rahman · 1 Comment

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An effective air purifier can cut back on indoor pollutants such as pollen, dust, dander, and smoke. Most people don’t know this, but when too little outdoor air enters a home, pollutants’ concentration increases indoors. This poses comfort and health problems.

In fact, a high concentration of pollutants indoors can cause asthma and respiratory issues.

There are many types and sizes of air purifiers on the market. Some air purifiers are effective at particle removal, while others are not. The best air purifier is designed for eliminating both particulates and odorous pollutants. The new Blueair Blue Pure 311 Auto is the one that can do both.

Recommended for medium-sized rooms, it’s energy-efficient.

Want to know more about the Blueair Blue Pure 311 Auto?

In our Blueair Blue Pure 311 Auto review, we’ll discuss its features, pros, and cons.

Jump to…

  • Specs
  • In-depth Review
  • Suitable Room Size
  • Operating Costs
  • Pros & Cons
  • Blueair Blue Pure 311 Auto vs. 411 vs. 211+

Blueair Blue Pure 311 Air Purifier

Check Current Price on Amazon

Blue Pure 311 Auto Specifications:

ParameterValue
Filtration TechnologyFabric pre-filter and 2-in-1 particle filter with activated carbon sheet filter enhanced by electrostatic charging (HEPASilent™)
HEPA ClassNon-HEPA
Filter Life6 months (based on 24 hrs of usage every day)
Maximum CADR250 cubic feet per minute (cfm) for Smoke
Room Coverage (8 ft ceilings)375 sq ft with 5 air changes per hour (calculate ACH for your room)
Sensors✔️ (particle sensor)
Fan Speeds3
Automatic Mode✔️
Noise Level23 – 53 dB
Rated Power35 Watt
Weight6.8 lbs
Dimensions20.5″H x 10.2″W x 10.2″D
BLUEAIR Bedroom Air Purifier, Air Cleaner Dust Pet Dander Smoke Mold Pollen...
10,568 Reviews
BLUEAIR Bedroom Air Purifier, Air Cleaner Dust Pet Dander Smoke Mold Pollen...
  • AUTO ADJUSTS SO YOU CAN REST EASY: One touch auto mode uses a particle sensor to monitor pollutant levels and adjusts fan to ensure...
  • CLEAN AIR IN MINUTES: Blueair’s HEPASilent dual filtration delivers up to 45% faster cleaning and up to 67% less noise than...
  • ONE OF THE QUIETEST AIR PURIFIERS: Quieter (23 dB) than whisper on low; ENERGY STAR rated - uses less energy (3W) than an LED lightbulb...
  • ASTHMA & ALLERGY: Removes 99.99% of pollen, helping reduce allergens and pollutants that trigger allergy and asthma symptoms
  • REMOVES ODOR & PARTICLES DOWN TO 0.1 MICRON: Ideal for smoke & smog during wildfire season; Removes 99.97% of airborne particles like...
$249.99
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Last update on 2023-01-28 at 06:12 / Affiliate links / Images from Amazon Product Advertising API

In-depth Review of Blueair Blue Pure 311 Auto Air Purifier:

Blueair is a prominent brand in indoor air purifying solutions. Its Blue Pure series purifiers appeal to people who care about their health and their indoor environment’s comfort. Today, people are mindful of the indoor air quality, and the best way to provide an extra layer of protection is to invest in the Blueair Blue Pure 311.

Hybrid Mechanical and Electrostatic Filtration System

The Blueair Blue Pure 311 Auto has a 3 stage mechanical filtration system that includes a pre-filter, particle, and carbon filter. The first line of defense is the fabric pre-filter. It traps large particles such as dust, hair, lint, and pet fur. Besides catching large particles, it extends the life of the primary filter.

Next is the combined Particle and Carbon filter. Made from coconut shell, the activated carbon filter neutralizes VOCs, smoke, and odors from cooking and pets. The main particle filter removes airborne pollutants such as pet dander, pollen, ultra-fine dust, and mold spores.

But the secret behind its superior performance is the HEPASilent technology. Traditional HEPA filters are dense, and purifiers push air through the media to trap small, medium, and large-sized particles.

When doing this, traditional air purifiers consume more energy due to high pressure drop. HEPASilent technology uses a low-dense fibrous filter, which is boosted with electrostatic precipitator filtration or ESP.

This combined mechanical and electronic filtration system removes 99.97% of airborne particles as small as 0.1 microns, including ultrafine dust. The unit consumes less energy too. When the filter traps germs, a high airflow rate and electrical charging prevent bacterial growth in the air purifier.

The manufacturer recommends changing the filters after 6 months if using the air purifier 24 hours a day. Cleaning the pre-filter is easy. Just toss it in your washing machine, and you’re good to go.

Performance and Noise

The Blueair Blue Pure 311 Auto has a CADR of 250 cfm (pollen), 244 cfm (dust), and 250 cfm (smoke). Perfect for medium-sized rooms, it can clean up to 375 square feet with five air changes in an hour.

The less-dense filters require less air pressure to push air through. As such, the Blueair Blue Pure 311 Auto can distribute more clean air in the room at lower fan speeds. While doing so, it makes less noise.

In fact, the unit’s sound level is 23 dB, which is lower than a whisper or rustling leaves at 30dB. This means you can run the air purifier all night without interrupting your sleep quality.

At the highest fan speed (Boost Mode), the unit’s sound level is 53dB, and this is slightly louder. Besides whisper-quiet operation, the unit consumes less energy, especially at the lowest fan speed.

The energy consumption rating of the Blueair Blue Pure 311 Auto is 3 to 35W. If you run the air purifier at the lowest fan speed for 12 hours a day, it’ll consume 0.04 kWh/day and 1.2 kWh/month.

If you run the air purifier at the highest fan speed for 12 hours a day, it’ll consume 0.42 kWh/day and 12.6 kWh/month.

Design

The unit comes with five fabric pre-filter color options. Made from non-woven gradient polypropylene fibers, the Scandinavian nature inspires the colors. You can change the pre-filters to match the decor of your living space. A hidden compartment in the pre-filter hides the power cord.

Blueair Blue Pure 311 Pre-filter Colors

The Blue Pure 311 Auto Air Purifier has the following dimensions: 20.5 by 10.2 by 10.2 inches. It has a cylindrical design with a 360-degree air intake. The bottom-to-top airflow concept allows the unit to filter and distribute more clean air in the room.

At 6.8 pounds, the unit is much lighter. For that, you can place the unit anywhere in a room or even bring it along. Thanks to the 360-degree intake, you don’t have to follow the strict rules for placement.

For example, some units require you to position them at least 50 cm from a wall or another appliance. With the Blue Pure 311 Auto Air Purifier, you can place it anywhere in the room without compromising its performance.

It has a one-touch auto mode. At the touch of a button, you can turn it on or off. Besides that, the one-touch auto mode allows you to maintain a healthy and comfortable environment. The unit auto-adjusts fan speed based on real-time data collected by the integrated particle sensor.

Suitable Room Size for Blueair Blue Pure 311 Auto:

*The room size calculation is based on an ideal situation. For best practice, consider the size of the room a little less than the calculated value.

If you have higher ceilings, then use our Air Changes per Hour Calculator to calculate the suitable room size.

Blueair Blue Pure 311 Auto Operating Costs:

Annual Filter Replacement: ~ $80 based on 6-month use per filter (check availability & filter price).
Monthly Energy Consumption: ~ $3 (based on 12 cents per kWh and 24 hours use on top speed per day). Use our Energy Usage Calculator to find out the bill based on your usage and the local energy rate.

BLUEAIR Bedroom Air Purifier, Air Cleaner Dust Pet Dander Smoke Mold Pollen...
BLUEAIR Bedroom Air Purifier, Air Cleaner Dust Pet Dander Smoke Mold Pollen...
$249.99

Last update on 2023-01-28 at 06:12 / Affiliate links / Images from Amazon Product Advertising API

Pros and Cons:

Pros
  • Hybrid mechanical and electrostatic filtration
  • High clean air delivery rate
  • Minimal design, One-button control
  • Lightweight and modular two-part design
  • Permanent and washable fabric pre-filter with multi-color options
  • Built-in particle sensor with auto mode
  • LED indicator for real-time air quality status display
  • Low noise level and energy consumption
  • AHAM Verified, CARB approved Energy Star Certified
Cons
  • No timers or remote control
  • The particle filter is not True HEPA grade
  • Electrostatic filtration might produce some ozone
  • One-button control can be complicated for many
  • Pre-filter color options sold separately

For more coverage >>> Blueair Blue Pure 211+ Air Purifier

Blueair Blue Pure 311 Auto vs. 411 vs. 211+:

The Blue Pure 311 Auto is the new lineup to fill out the gap between the Blue Pure 411 and Blue Pure 211+ model. They all have a 3 stage mechanical filtration system with an electrostatic filtration.

Both 311 Auto and 411 are lightweight and have a similar cylindrical design form factor. While the 211+ is heavier and comes in a square-shaped design. The Blue Pure 211+ is slightly wider than the Blue Pure 311 Auto, but their height is almost equal.

Here are the differences between the units.

CADR

Blue Pure 411 is for small rooms, has a CADR of 105 cfm for Smoke. Blue Pure 311 Auto is for medium rooms, has a CADR of 250 cfm for Smoke. Blue Pure 211+ is for large rooms, has a CADR of 350 cfm for Smoke.

Built-in Particle Sensor

Blue Pure 311 Auto has a built-in particle sensor, while the Blue Pure 411 and 211+ doesn’t have any.

Pre-filter Colors

To match your living space, Blueair makes it possible for users to change the pre-filter. The Blue Pure 311 Auto comes with a single pre-filter color, while the Blue Pure 411 and 211+ comes with two pre-filter colors – blue and dark grey. The rest of the colors are usually sold separately.

Blueair Blue Pure Air Purifier
Small Coverage
Blue Pure 411
Medium Coverage
Blue Pure 311 Auto
Large Coverage
Blue Pure 211+
Image
BLUEAIR Bedroom Air Purifier, Small Room Air Cleaner Dust Pet Dander Smoke...
BLUEAIR Bedroom Air Purifier, Air Cleaner Dust Pet Dander Smoke Mold Pollen...
BLUEAIR Air Purifier Large Room, Air Cleaner for Dust Pet Dander Smoke Mold...
Tobacco Smoke CADR
105 cfm
250 cfm
350 cfm
Room Coverage (8 ft ceiling)
160 sq ft with 5 air changes/hr
375 sq ft with 5 air changes/hr
525 sq ft with 5 air changes/hr
Air Quality Sensor
Noise Level
17 - 46 dB(A)
23 - 53 dB(A)
31 - 56 dB(A)
Form Factor
Cylindrical, 16.7 x 8 x 8 in, 3.4 lbs
Cylindrical, 20.5 x 10.2 x 10.2 in, 6.8 lbs
Square, 20 x 13 x 13 in, 12.5 lbs
In-depth Review
-
-
Blueair Blue Pure 211+ Review
Customer Ratings
Amount of Reviews
9,622 Reviews
10,568 Reviews
12,033 Reviews
Current Price
$98.00
$249.99
$299.99
Bring it Home
Get it from Amazon
Get it from Amazon
Get it from Amazon
Small Coverage
Blueair Blue Pure Air Purifier
Blue Pure 411
Image
BLUEAIR Bedroom Air Purifier, Small Room Air Cleaner Dust Pet Dander Smoke...
Tobacco Smoke CADR
105 cfm
Room Coverage (8 ft ceiling)
160 sq ft with 5 air changes/hr
Air Quality Sensor
Noise Level
17 - 46 dB(A)
Form Factor
Cylindrical, 16.7 x 8 x 8 in, 3.4 lbs
In-depth Review
-
Customer Ratings
Amount of Reviews
9,622 Reviews
Current Price
$98.00
Bring it Home
Get it from Amazon
Medium Coverage
Blueair Blue Pure Air Purifier
Blue Pure 311 Auto
Image
BLUEAIR Bedroom Air Purifier, Air Cleaner Dust Pet Dander Smoke Mold Pollen...
Tobacco Smoke CADR
250 cfm
Room Coverage (8 ft ceiling)
375 sq ft with 5 air changes/hr
Air Quality Sensor
Noise Level
23 - 53 dB(A)
Form Factor
Cylindrical, 20.5 x 10.2 x 10.2 in, 6.8 lbs
In-depth Review
-
Customer Ratings
Amount of Reviews
10,568 Reviews
Current Price
$249.99
Bring it Home
Get it from Amazon
Large Coverage
Blueair Blue Pure Air Purifier
Blue Pure 211+
Image
BLUEAIR Air Purifier Large Room, Air Cleaner for Dust Pet Dander Smoke Mold...
Tobacco Smoke CADR
350 cfm
Room Coverage (8 ft ceiling)
525 sq ft with 5 air changes/hr
Air Quality Sensor
Noise Level
31 - 56 dB(A)
Form Factor
Square, 20 x 13 x 13 in, 12.5 lbs
In-depth Review
Blueair Blue Pure 211+ Review
Customer Ratings
Amount of Reviews
12,033 Reviews
Current Price
$299.99
Bring it Home
Get it from Amazon

Last update on 2023-01-28 at 06:36 / Affiliate links / Images from Amazon Product Advertising API

Questions and Answers

Q. Does the unit have an air quality sensor?
A. Yes, the purifier has an integrated particle sensor. When enabled, it detects the concentration of pollutants in the room and displays the results in real-time using LED lights. The LEDs change color from red to orange and blue. Red means the air is polluted, orange is moderate, and blue is good.

Q. Can you vacuum the pre-filter?
A. You don’t have to vacuum the pre-filter. Just toss it in your laundry machine, and it should be clean in a couple of minutes.

Q. Is the unit rated safe for ozone?
A. Yes, the California Air Resources Board rates the unit safe for the ozone.

Final Thoughts

Considering all the features, such as automatic mode, this is an impressive unit. Its powerful filtration system allows you to maintain a healthy environment. This helps to reduce the health effects of indoor air pollution.

The customization options come in handy as you can match the unit with your home decor. As such, it brings something extra to your home.

Check Current Price on Amazon
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Filed Under: Smart Air Purifier

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Musfikur Rahman

A former smoker, who has become a clean air enthusiast, created this blog to review different types of air purifiers so that you can make an informed decision.

Reader Interactions

Comments

  1. Kevin Meyer says

    September 6, 2021 at 3:26 pm

    Your review is spot on. I got the 311 Auto six weeks ago for our bedroom because my wife, who has COPD, was coughing a lot at night due to sinus drainage. We clean our house regularly and change the furnace/AC filter monthly, but something was in the air that triggered allergy-like symptoms. After a few days of purifying, she stopped coughing in bed. She also coughed after an extended time in the living room, which is frequent since we are retired, and she has rheumatoid arthritis, so I got the BlueAir 7470i. Now she no longer has those coughing spells. Both air purifiers run 24/7 on auto mode, and we don’t hear them.

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