Blueair Classic 405 HEPA Air Purifier Review

Blueair Classic 405 HEPA Air Purifier: QUICK OVERVIEW


Value For Money



What We Like

  • Large coverage area
  • Good warranty
  • HEPASilent filter – efficient and quiet

What We Don't Like

  • Noisy at the highest speed
  • Plastic odor after the unboxing

Unfortunately, it’s a sad truth that air pollution is a killer, and in fact, the air inside your own home is probably far more polluted than you might ever have imagined.

The good news is that with the incredible advancement in new technology, air purifiers are better than ever before and can go a long way to protecting your precious family from airborne pollutants and health hazards that can be associated with everyday products like household cleaning products and even furniture flame retardants. 

When you consider that air purifiers can also help attract and trap dust and allergens that might be bothersome to anyone in your household with asthma for example, then the reasons to invest in one start to stack up very heavily in their favor.

The main thing to point out though when you are looking to purchase an air purifier is that the size of the room you are looking to ionize needs to be relative to the effects of the purifier. If the amount of air inside the room far exceeds the amount of air that your purifier can handle cleaning, then it’s pretty redundant.

Older style air purifiers also used to produce high levels of ozone as an unwanted by-product, so advancements including HEPA filters have vastly improved the efficacy of air purifiers that are now available to purchase.

With so much information and misinformation, we appreciate that it can sometimes be daunting even to know where to start in your search to improve the air quality and the health of your family.

So we have scoured the internet and done hours of research to bring you some incredible product recommendations. Today it’s the turn of the Blueair Classic 405 HEPA Air Filter so let’s get right in and discover what’s so great about this make and model.

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Blueair Classic 405 HEPA Air Purifier Review

The Classic from Blueair uses what’s known as a HEPASilent trademarked technology and the vital point to note about that is that it is scientifically and clinically proven to remove an incredible 99.97% of all pollen, dust, and viruses in the air surrounding your home.

The Classic 405 also goes one step further and has Whisper-Silent performance which means it’s quiet, yes, but it also features an advanced filterthat is less dense than older and more traditional filters, so it requires less pressure and thereby allows maximum airflow efficiency.

It delivers true HEPA filtration performance, quietly and efficiently, which is better for you and your family. There are also plenty of other standout features that we truly recommend.

For a start, it’s Wi-Fi enabled which means you can very conveniently operate it via the Blueair Friend app. With that app, you can do things remotely like change the fan speed, set the child lock, schedule night mode settings or just switch the unit on or off.

It’s also compatible with Amazon’s Alexa and IFTTT. We’ll take a look at more of the recommended features further down in our review.

Who is this product for?

This product is for any family that cares about the air they breathe and the clean, quality of that air. Not just for their kids, but also for their pets too.

Airborne pollutants come from everywhere and include dust, mold, pet dander and pollen. A lot of those pollutants are naked to the visible eye, but they can trigger allergic reactions, asthma attacks, and common problems like hay fever.

Your family will breathe and sleep easier if the air is cleaner and the way in which it’s purified is efficient and quiet too. That’s where the Blueair Classic comes into its own. It’s best suited to medium-sized rooms of 330-400 square feet for it to be most effective, so we’re talking a small bedroom, living room, kitchen or an office environment.

What’s included? 

You get the Blueair Purifier Classic 405 itself measuring in at 23” x 10” x 11” and covering up to 430 sq.ft of room/airspace. It comes with a HEPA filter which the manufacturer recommends should be changed every 6 months if the unit is being used regularly.

Overview of key features

Battles allergies, asthma, and hayfever

The HEPA Silent technology delivers an electrostatic charge that is effective at capturing 99.97% of airborne pollutants including pet dander, pollen, dust and mold.

Certified clean air delivery rate (CADR) of 280 cubic feet per minute

Works on the basis of 5 air changes per hour.

3 Fan Speeds

In addition to the Whisper Quiet operation, 2 additional fan speeds allow you, your family, and your domestic pets to breathe and sleep easier.

WiFi Enabled

Ability to remotely control either via the Blueair Friend app or can also be connected to Amazon Alexa for voice commanded actions.

Fully Certificated

Energy Star rated and certified by the California Air Resources board for ozone emissions.

Can you add a SmokeStop filter to the Blueair Classic 405?

Yes, the 400 Series SmokeStop Filter is designed specifically to fit members of the 400 series, including the 405, 403, 480i, and 450E. So say goodbye to tobacco smoke and odors.

Is the Smoke Stop filter included?

No, the SmokeStop filter does not usually come included, but it is available as a separate accessory and would then replace the standard particle filter.

Will I need to read the Blueair User Manual?

The Classic 405 is incredibly easy to setup. If you would like to preview the 405 user manual then you can take a look at the manufacturer's instruction guide click here

If you would like to replace your filter then you can follow the steps on page 12 entitled "Changing the filters" click here.


If you have a much larger house or living space that you want to purify then take a look at the Blueair Classic 605. It features all the same great features and benefits in a much larger housing that can handle a room size of up to 700 sq.ft and delivers certified clean air at a rate of 500 cubic feet per minute.

Yes, it’s a large unit, but it still manages to provide true HEPA filtration performance with less noise and more efficient air flow than ever before.


If you care about the quality of the air that your family is breathing inside your home and you want to ensure that everyone under your roof is adequately protected from airborne allergens and pollutants then the Blueair Classic 405 Hepa Filter is a sensible and well-recommended choice. It’s reliable and effective, sturdy and efficient, and it manages to do all of that in a supremely quiet and unobtrusive way.

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