HomeReviewsAir Purifier ReviewsBlueAir Blue Pure 311i+ Max vs AirDoctor 3500i Air Purifier

BlueAir Blue Pure 311i+ Max vs AirDoctor 3500i Air Purifier

Both BlueAir and AirDoctor are popular and trusted brands that make air purifiers. And this time, we tested their 2 popular models.

Both models – AD3500i and Blue Pure 311+ Max have a similar size, coverage areas, features, and more, so we thought it would be interesting to compare them.

Air Doctor sale Airdoctor sale best price buy now with 280 off AD3500

Here are some stats before we jump to the article.

BlueAir Blue Pure 311+ Max
AirDoctor 3500i
Pre-Filter, Particle & carbon filter
Pre-Filter, Carbon/VOC Filter, UltraHEPA Filter
Coverage 5x/hour
Coverage 5x/hour
446 sq. ft.
510 sq. ft.
Coverage 2x/hour
Coverage 2x/hour
1,116 sq.ft.
1,276 sq. ft.
CADR (Smoke)/CFM
CADR (Smoke)/CFM
Fan Speeds
Fan Speeds
Power Consumption
Power Consumption
4 - 38 watts
11 - 110 watts
Noise Levels
Noise Levels
23- 50 dB
39- 59 dB
12.5" (W) x 12.5" (D) x 19" (H)
15.75" (W) x 8.35" (D) x 23" (H)
8 lbs
18 lbs

BlueAir Blue Pure 311+ Max vs Air Doctor 3500i Air Purifier Design 

BlueAir Blue Pure 311+ Max vs airdoctor 3500i air purifier design comparison

Air Doctor 3500i design is classic, while Blue Pure 311+ Max is more stylish and modern. BlueAir has 5 washable pre-filters in various colors and works as a body.

AirDoctor, on the other hand, has only one color option – white.

Both air purifiers are similar in size but in different forms. AirDoctor has one side air inlet and outlet through the top. BlueAir has a 360-degree air intake and outlet through the top.

Both air purifiers have touch controls on the top and particle sensors. BlueAir buttons are very small, while Airdoctor has large and easy-to-understand controls. Also, both have air quality status shown by LED indicators.

BlueAir Blue Pure 311+ Max vs Air Doctor 3500i Air Purifier Performance

While design is a subjective factor, performance isn’t.

BlueAir Blue Pure 311+ Max has a washable fabric pre-filter and HEPA filter connected with a thin carbon filter.

BlueAir Blue Pure 311+ Max Replacement filter
Source: amazon.com

Pre-filter removes larger particles such as dust. Carbon filter remove odors, but this one is thin, so don’t expect it to filter large amounts of cooking or pet odors.

HEPA filter traps pollen, dust mites, pet dander, mold, bacteria, and other particles at least 99,97% down to 0.1 microns.

With a clean air delivery rate of 300 cfm, Blue Pure 311+ Max can clean 446 square feet of large spaces with 5 air changes per hour and 1,116 square feet with 2 air changes.

AirDoctor 3500i has a pre-filter, thick carbon/gas trap/VOC filter, and a patented UltraHEPA filter.

AirDoctor 3500i has a pro filtration process

The pre-filter is washable. It traps the largest particles and helps extend the inner filter lifespan.

Carbon/Gas/VOC filter is thick enough to filter large amounts of gases, odors, and VOCs.

The last one is AirDoctor’s patented UltraHEPA filter, which is 100 times more effective than standard HEPA filters. It captures 99.95% of particles as small as 0.003 microns.

So that includes dust mites, mold, pet dander, viruses, and bacteria. Practically everything.

Air Doctor 3500i CADR is 326 cfm, and it covers 510 square feet of large spaces with a 5x air change rate per hour and 1,276 square feet with 2x air change every hour.

So BlueAir’s advantage is 360-degree air intake, while Airdoctor is better at filtering and capturing odors and smaller particles. Airdoctor also covers a bit larger space.

BlueAir Blue Pure 311+ Max vs Air Doctor 3500i Air Purifier Features

Both are smart devices with a lot of great features.

Both can switch between various fan speeds or choose auto mode. Auto mode works perfectly on both units thanks to particle sensors – air purifiers automatically adjust fan speed based on air quality in your room.

Both air purifiers can be used during the night in your bedroom, as they have night modes with the option to dim lights.

Most air purifiers, AirDoctor and BlueAir, also have filter replacement indicators.

Airdoctor also has a timer option, which Blue Pure doesn’t. It allows you to set a specific time for the air purifier to turn off.

The best features for both air purifiers are wifi and the app. Both have great apps with full control options over air purifiers.

Both apps show real-time particle count and air pollution; both have on/off options, fan speed adjustment, night mode, and child lock options from the app. Also, both show filter lifetime left in percentage.

BlueAir also has voice control assistance, while the AirDoctor app can give control access to a friend.

BlueAir Blue Pure 311+ Max Pros And Cons

+ BlueAir Blue Pure 311+ Max is quieter and consumes less power than AirDoctor 3500i.

+ Replacement filters are cheaper.

+ Sleek and Stylish design with various color options

+ Lightweight

– Pre-filter vacuuming and washing is time-consuming

– After several washing times, the pre-filter won’t look as good as the new

– Small control buttons

Air Doctor 3500i Air Purifier Pros And Cons

+ Better purification with the capability to trap a lot smaller particles

+ Better at filtering odors and smoke

+ Covers larger spaces

+ Easy to change filters

– Consumes a bit more energy and is noisier than BlueAir

– More expensive replacement filters

BlueAir Blue Pure 311+ Max vs Air Doctor 3500i Air Purifier: Which Is Better?

Both air purifiers are great and equipped with the latest technologies. Which one is better depends on your needs.

If you aim for an air purifier that can better clean your room’s air and eliminate odors and smoke, go for Air Doctor.

If you need a cheaper and quieter air cleaner, go for BlueAir.

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