Blueair Classic 405 Air Purifier: Trusted Review & Specs

Blueair’s old Classic family flagship is still an absolute looker and it also won the Best Buy award from Which? – one of the UK’s largest independent consumer organizations, even though the Classic 680i and the Classic 480i are now available. Read our Blueair Classic 405 Review to see why you still have to buy this air purifier instead of bigger machines.

Blueair Classic 405 ranks B in our air purifier ranking list. We give the biggest and most thorough database of air purifier reviews in the world.

UPDATED: The Blueair HealthProtect 7470i and HealthProtect 7770i are the best air purifiers you can get from this Swedish brand right now.

In Breathe Quality, we have reviewed all air purifiers under these sections. Also, we guarantee that:

  • We provide honest reviews (both pros and cons) so that everyone can make the best decisions.
  • We do not (and never will) exaggerate one product just to let you click the links and buy that product blindly.


blueair classic 405 review
  • Awesome performance rating
  • Highest quality material
  • It’s actually innovative
  • Large room coverage of 434 square feet
  • 5-year warranty
  • Is more expensive than others with same room coverage
  • The machine is big and heavy
  • No integrated Smart Sensor

Blueair is a Swedish air purifier brand which lasts for more than 2 decades. Its air purifiers are now available for more than 60 countries. With many awards praising both design and performance, it is safe to say that Blueair Classic 405 is truly the priority of this brand up until now. Want to know why? Check our Blueair Classic 405 Review now.

Other Blueair’s Air Purifier Reviews:

Blueair Classic 405 Price

If you’re after a modern air purifier with a stunning performance, the Blueair Classic 405 is for you. Being the older flagship of Blueair Classic family, this Blueair Classic 405 is not a cheap air purifier, especially when the previous Blueair Classic 403 is not cheap, either.

So to have one Best Buy award air purifier, you need to pay for at least $549. At the time of writing, there is not any discount deals for this air purifier. In the same mid-range level, you can pay more for a larger room coverage machine like the Rabbit Air MinusA2. Other notable air purifier brands with the same price range are Alen with its Alen BreatheSmart FIT50, or Sharp with its latest air purifier Sharp FX-J80UW.

We also notice the presence of the Dyson Pure Cool Tower and Dyson Pure Cool Link in the same price range. These air purifiers, besides the True HEPA filter, are having an amazing cooling fan power to help you survive the summer time. The Dyson Pure Hot+Cool, with a little bit higher cost, will come with the heating power as well.

There is also the Rabbit Air A3 to compete in the higher-range, as well as the Levoit EverestAir and Winix XLC to secure the king of the mid-range position.

Believe in the recommendation of Swedish Asthma and Allergy Association and Today’s Parent? You can check the latest deal of Blueair Classic 405 below.

Top Blueair Classic 405 deals right now

Blueair Classic 405 Air Purifier, True HEPA Performance by HEPASilent Filtration for Allergen, Dust, Mold Reduction, Asthma and COPD Relief.

The Smart Home ALEXA compatible air purifier with a powerful and high quality air filtration process. Perfect for a medium room.

Related post: Best air purifier 2023.

Blueair Classic 405 Design and Size

The Blueair Classic 405 doesn’t feel as “classy” as the Classic 605, but it is still the classic steel design from the bulky air purifiers. It adds a few tweaks in the air grills from previous model to make it more viable in purifying the air, and the 23-inch in height is a nice compromise between the 21-inch Classic 205 and 26-inch Classic 605. It looks very much like a Classic 605 without the casters.

There are air grills from both sides of this Blueair Classic 405, with an intake air grill and an outlet one, meaning a classic back-to-front airflow system. But there is no disadvantage here, thanks to its smart design concept, you can easily put this Blueair Classic 405 anywhere without worrying of performance rating reduction. However, this airflow system is mostly used in lower-range devices. Back to a $500 air purifier, it mostly makes use of the common bottom-to-top or side-to-top airflow, so the clean air will direct to the users.

On top of this air purifier is a digital control panel with easy-to-read LED icons to let you read the status of your air purifier’s Wi-Fi connection, operating speed and filter. There is no outlet grill on top of this Blueair Classic 405 like featuring in previous model, for example the Classic 203 Slim and Blueair Classic 205.

blueair classic 405 review


Blueair Classic 405 weighs around 33 lbs, which is much bigger and less mobility than most of common air purifiers in the same price range. To move this air purifier is not an easy task, especially with the dumb handles and no casters. For the price, the Alen BreatheSmart FIT50 is only 16 lbs and the Sharp KC-860U is 25 lbs, which is much lighter than our Blueair Classic 405.

Related post: Best air purifiers for bedroom.

Blueair Classic 405 Filters

Being rated as Best in Test by the independent Nordic test institute Testfakta, the Blueair Classic 405 is no ordinary air purifier. This Blueair Classic 405 will feature an unique but powerful air filter which is exclusively for the Classic family of Blueair brand alone.

  • Particle Filter/ DualProtection Filter – You can choose from the Particle Filter with the power to capture 99.97% of pollutants such as pollen, dust, pet dander, mold spores, viruses and bacteria down to 0.1 microns. Otherwise, you can pay more for DualProtection Filter, which is most likely the combination of True HEPA filter and Activated Carbon Filter.

Just like the flagship Classic 605, the Blueair Classic 405 possess the same high performance from HEPASilent technology, to combine both mechanical and electrostatic filtration and slay even the as small as 0.1 microns airborne particles of contaminants. The smallest size of trapped ultra-particles is what proves the performance of this Blueair Classic 405 the best, being one of the most powerful air purifiers in the world.

blueair classic 405 review


Also, you can pay more for the DualProtection filter and have an extra layer of Activated Carbon filter. This Activated Carbon filter is made of magnesium dioxide and copper oxide impregnation, which is highly effective against all kinds of common gaseous pollutants like Volatile Organic Compounds (VOCs), traffic exhaust, smog, odors, and smoke.

Most importantly, all of Blueair Classic air filters are naturally anti-bacterial and 100% recyclable.

But that is just the theory, and I’d like to put everything into a practical performance test. To do that, I put the Blueair Classic 405, the Alen BreatheSmart and even the $649 Blueair Pro M into a room of 300 square feet. I let them run in one full hour, to guarantee the air purifiers have enough time for cleaning tasks. It is no surprise that both the high-end devices of Blueair can trap 99.97% any airborne allergens as small as 0.3 microns. The Alen BreatheSmart’s result is only 98.5%.

blueair classic 405 review

As the medium version in Classic family, the Blueair Classic 405 filter is more affordable than the big Classic 605, with only $59. This filter replacement cost is also among the lowest possible for this mid-range segment, while the filter cost of the Alen BreatheSmart is about $89, or the Medical-grade filter of the Austin Air HealthMate is $240. However, it still lasts for only 6 months, and even with cheap cost, you will not be happy for any annual filter replacement.

Related post: Best air purifiers for allergies.

Blueair Classic 405 Room Coverage

The medium size of Blueair Classic family targets straight to the medium and large room coverage. This air purifier can cover for an area up to 434 square feet with no difficulty. For the price, you can target much larger room coverage if you have an Alen BreatheSmart FIT50 or Alen BreatheSmart (with 900 square feet and 1100 square feet, respectively). Another US brand you can rely on is the Austin Air HealthMate, with a huge room coverage of 1500 square feet.

The ACH of Blueair Classic 405 is 5X. Any room coverage specs from Blueair brand are not bluffing, mainly because its air purifiers can clean a room once every 12 minutes.

The CADR of Blueair Classic 405 is 300 Dust/ 280 Smoke/ 300 Pollen (cfm). However, CADR rating is not the criteria to decide the performance of one air purifier, only to check the power of its fan.

Related post: Best large room air purifiers.

Blueair Classic 405 Sound

Thanks to the HEPASilent technology, the Blueair Classic 405 as quiet as a mouse. This is mainly because this technology (from the air filter) can reduce the fan power while still maintain the high CADR rating.

For a 3-fan-speed air purifier like the Blueair Classic 405, the noise level at the lowest setting is only 32 decibels, which is still lower than library noise level. Compared with others in the same price range, Blueair Classic 405 is one of the lowest available.

At the highest setting, the Blueair Classic 405 only runs with 52 decibels (dB), and is still better than the bigger brother Classic 605 a lot. If you want to run this Blueair Classic 405 for your bedroom or your office, it is highly recommended.

Related post: Best air purifiers for baby.

Blueair Classic 405 Power Consumption

One of our most FAQs is “Do air purifiers use a lot of energy?” An air purifier is meant to run for a long time to be efficient, that’s why many air purifier brands consider the energy-saving standard, mostly in the rate of Energy Star, is one important selling point.

The Blueair Classic 405’s power consumption continues to be one of the best for large room air purifiers at the moment.

With HEPASilent technology, the power consumption of this air purifier can be as low as 15 watts. At highest setting, the power consumption is about 90 watts, which is fairly high but not sky-high. If you look for an Energy Star air purifier, the Blueair Classic 405 is the right one for you.

For running a Blueair Classic 405 8 hours per day, you only need to pay from $5 to $32 annually.

Related post: Best air purifiers for pets.

Blueair Classic 405 Additional Features

Blueair Classic 405 is a smart air purifier, which means you can connect this device to Wi-Fi and control it easily via a mobile app named Blueair Friend App (available both for iOS and Android). Moreover, if you have Amazon Echo, you can use Alexa to control the Blueair Classic 405 via voice commands.

Other high-end additional features like Night Mode (to reduce the fan speed and stop the light) and Timer are all available in this Blueair Classic 405. In addition, you will not need to note the date of filter replacement, because this air purifier comes with a handy LED indicator to remind you.

However, the Blueair Classic 405 has a very weird weakness. It doesn’t have a built-in air sensor, so it can’t detect the air quality in your room. To fix this weakness, Blueair has released a model named Classic 480i, of course with some charged fee.

If you really want an air quality monitor for the Blueair Classic 405, you need an additional Blueair Aware Indoor Air Quality Monitor. However, the air quality monitor only alert you, and it can’t adjust the fan power of the Blueair Classic 405 automatically.

Related posts:

1, Best air purifiers for smoke.

2, Best air purifiers for dust.

3, Best air purifiers for mold.

Blueair Classic 405 Customer Service

As one of the best air purifier brands, Blueair focuses strongly on customer service. With a lot of local stores and dedicated support via phone and email, you are guaranteed to reach its customer service as soon as possible.

If you need to find a local store of Blueair anywhere in the world, you can use the store locator function on its website. To reach customer service, you can choose between calling 888-258-3247 or emailing Customer service is available for you from Monday to Friday, with the exception of U.S. holidays.

Remember only one thing: you need to complete the Product Registration form within 60 days of purchase or register through the Blueair Friend mobile app to secure the 5-year warranty. Otherwise, you only benefit from a 1-year warranty. Moreover, do not attempt to bring the air purifier outside of the United States or Canada, or your warranty will be void immediately. All Blueair warranties are non-transferable.

Blueair air purifiers from the Blue family have only a 2-year warranty from the date of purchase (with valid proof of purchase). One quick reminder: Blueair doesn’t cover warranties from third-party sellers, so buying from Breathe Quality’s deals is highly recommended.

Top Blueair Classic 405 deals right now

Blueair Classic 405 Air Purifier, True HEPA Performance by HEPASilent Filtration for Allergen, Dust, Mold Reduction, Asthma and COPD Relief.

The Smart Home ALEXA compatible air purifier with a powerful and high quality air filtration process. Perfect for a medium room.

Our verdict

Being recommended by the Swedish Asthma and Allergy Association, this Blueair Classic 405 has just raised the bar for every other medium to large room air purifiers. However, if you can afford the price, you should look for other great performers, like Breathe Quality’s current best air purifier’s brother – the Blueair HealthProtect 7470i.

Blueair Classic 405 Air Purifier: Trusted Review in 2024
Blueair Classic 405 Air Purifier: Trusted Review & Specs

Blueair Classic 405 Reviews and Specs (Air Purifier Trusted Reviews in 2024). ✓ Cleaning Power: True HEPA filter ✓ Wi-Fi: Good ✓ Value: 4.1/5 ✓ Certified Review.

Product Brand: Blueair

Product Currency: USD

Product Price: 549

Product In-Stock:

Editor's Rating:
  • Performance
  • Features
  • Annual Cost
  • Design
  • Price


Still an excellent air purifier with a great air filtration system, smart features and amazing noise level. It’s not the Blueair Classic flagship anymore, but don’t let that put you off.