Blueair Classic 405 Review In 2022

A classic reinvented with focus on performance and build quality, Blueair 405 excels on its overall durability thanks to the galvanized steel body with no off-gassing. On par with other Blueair Classic air purifiers on design, specification, noise level, power usage and of course the unmissable HEPASilent technology, does Blueair Classic 405 smaller body offers enough value to consider over the bigger 605? Head to our extensive review below.
online price (US)**
±549.99 $$$$$$$/ 7

(annual filter cost ±180-360)

** MRSP (Manufacturer's Suggested Retail Price)/ RSP (Retail selling price) is accurate at the time of posting.
^ Annual filter cost is calculated based on filter price and 12 hours of usage. Pricing could vary depending on air quality, usage frequency, and speed.
` The indicated online price guides as follows: $ = under $50, $$ = $50-100, $$$ = $101-200, $$$$ = 201-300, $$$$$ = $301-400, $$$$$$ = 401-500, $$$$$$$ = over $500.

Blueair 405 Specification

ProductBlueair 405
20 x 23 x 11 in
(50.8 x 58.4 x 27.9 cm)
Weight33 lb (15 kg)
Coverage (up to)430 sq. ft. (40 m2)
Airflow speed120 - 350 cfm (204 - 595 m3/h)
Dust free (CADR)300 cfm (510 m3/h)
Pollen free (CADR)300 cfm (510 m3/h)
Smoke free (CADR)280 cfm (476 m3/h)
Humidifying(H) speed
- Lifespan
- Replacement cost ($)
HEPA filter
- Lifespan
- Replacement cost ($)
Blueair Classic 400 Series Particle Filter
6 - 12 months
+- 59.95
Carbon filter
- Lifespan
- Replacement cost ($)
Blueair Classic 400 Series SmokeStop Filter
6 - 12 months
+- 119.95
Ionizer/ TechnologiesHEPASilent Technology
UV-light/ PCO
Other filter
All-in-one filter
- Lifespan
- Replacement cost ($)
Optional/ Addon
Noise level32 - 52 dB(A)
Power usage level15 - 90 W
Timer/ SchedulerVia App
Auto mode
Air qualityAQ indicator
Filter change indicator
More color options
Wi-Fi/ BTBluetooth
Remote control
Child lock
Warranty5 years
Email/ Phone support

Key Features

  • 3-stage filtration with HEPASilent Technology
  • Wi-Fi ready (Blue Friend app/ Alexa)
  • Smartphone Controlled (timer, fanspeed, LED light, night mode, child lock, tracking)
  • Electrostatic Particle-charging (Ionizer)
  • 400 Series Particle Filter
  • 400 Series SmokeStop Filter
  • 3 fan speed
  • [OPTIONAL] Blueair Aware monitor
  • 5 years warranty

Design And Usability

Blueair 405 dimension
20 x 23 x 11 in
(50.8 x 58.4 x 27.9 cm)
Blueair 405 weight
33 lb (15 kg)

At typical Blueair classic fashion, Blueair 405 is built with fully recyclable galvanized steel that will not release toxin chemicals like plastic based counterpart. The 20 x 23 x 11 in dimension is between 205 and 605. Hardly consider compact, it is still suitable for bedroom or tight corner although you should never place it under a shelf due to its 33 lb weight. Mobility wise is not great despite the lighter weight and side handles as Blueair Classic 405 does not comes with casters by default like 605.

Continue with controls and usability, Blueair 405 can be controlled remotely via smartphone (more on this later) and there is physical control panel at the usual top spot with the same button layout. Each button is clearly labelled with live LED icon update. E.g. the fan speed LED icon will light up grey when there is no power source, outer circle blue with all bars are grey with power source (plugged in), 1 blue bar at first speed, 2 blue bars at second speed and 3 blue bars at third speed. As for middle Wi-Fi button, the LED icon will remain grey if there is no Wi-Fi, blinking when there is Wi-Fi connection and is ready to connect and stay with blue when it is Wi-Fi connected. Finally for the filter button, LED icon will light up in grey + blue when no replacement filter is needed and change to orange when filter change is needed. Simply hold the button for 5 seconds to reset the LED status.

Finishing up with the specification, you have the standard 3-stage HEPASilent Technology, 3 speed, smartphone access, easy filter replacement with no screws needed, filter replacement indicator, zero ozone emission, CARB certified, ENERGY STAR rated and 5 years warranty.

Blueair Friend app

Blueair Classic 405 is Wi-Fi ready for remote control via your smartphone. By installing Blueair Friend app in either Android or iOS, you could remotely adjust the 3 airflow speed, LED brightness intensity, setup timer, activate/ deactivate child lock, night mode and finally change speed/ LED at specific hours and days. For “I” series models that comes with built-in sensors or the optional Blueair Aware monitor, you could enable Auto mode for autonomous operation, monitor and keep track room air quality based on your various indoor activities. You could also keep track real time outdoor air quality in most major urban areas and few other miscellaneous AQ logs.

Airflow, Coverage, And CADR

Blueair 405 coverage
Purifying coverage
430 sq. ft. (40 m2)
Blueair 405 fanspeed
Blueair 405 has an equally impressive 120 - 350 cfm airflow delivery rate that greatly contributed to the wide 430 sq. ft. purifying coverage. Ideal for large room size including living hall, master bedroom, lounge or kitchen. At 5 air charges an hour, airflow is consistent and fully adjustable via the standard 3 fan speed. As with all Classic series air purifier, you have comprehensive air inlet located at bottom, back, sides while air outlet is at side and mostly top.
Blueair 405 dust CADR
300 cfm (510 m3/h)
Blueair 405 pollen CADR
Pollen CADR
300 cfm (510 m3/h)
Blueair 405 smoke CADR
Smoke CADR
280 cfm (476 m3/h)
Clean air delivery rate is equally remarkable tally with airflow delivery rate. You have the dust and pollen CADR stand high at 300 cfm while smoke CADR is at 280 cfm. The strong return means hyperallergic or asthmatic person can truly benefit from it. To compare with other Classic Blueair purifiers, click on the above specification comparison link.

Filters And Performance

Blueair Classic 405 uses the familiar 99.97% efficiency rate HEPASilent Technology that manage unwanted airborne particles as small as 0.1 micron via electrostatic and mechanical filtration. How the air purifier works is electrostatically charge any incoming pollutants first before passing on to the filter media. Pollutants like mold, pollen that are charged will be more clingy to the particle filter thus increasing the capturing efficiency rate. Likewise the SmokeStop Carbon filter will work the same way except it will focus more on electrostatically charged smoke, gas and odors. Instead of using chemical-based bacteriostats that inhibit bacteria and mold growth, Blueair 405 filters are made with natural, waterproof anti-bacterial polypropylene fibers. Additionally, the thermally bonded, gradient structure filter design also prevent particles from escaping the filter despite under heavy load. Finally Blueair 405 also slightly reduce ozone level by releasing cleaner, less ozone concentrated air.

Noise And Energy Usage

Blueair 405 noise level
Noise level
32 - 52 dB(A)
Blueair 405 power consumption
Power consumption
15 - 90 W
32 - 52 dB noise level is very reasonable thanks to the lower density filter and fan placement. Similar range model usually has higher noise output at higher/ maximum speed although in real-life usage, no other can tell the differences. At low speed it is perfectly find for use at night time. 15 - 90 W Power consumption is also impressive which uses less than a light bulb at low speed. On average you should expect an energy consumption that is no differences than other household appliances.
Noise TypeDecibels
Blueair 40532 - 52 dB(A)
Breathing10 dB
Rustling leaves20 dB
Whispering/ Quiet library30 dB
Light rainfall40-50 dB
Conversation50-60 dB
Vacuum cleaner/ Hair dryer/ Washing machine65-80 dB
City traffic80-90 dB

Pricing And Maintainence Cost

Blueair 405 MRSP/ RSP
+- 549.99
Blueair 405 annual filter replacement cost
Annual Filter Cost
+- 180 - 360
^ Replacement filters/ estimated cost
Blueair 405 is cheaper than 605 but still relatively expensive in our book. Annual filter replacement cost on the other hand is darn expensive especially if you utilize it on a daily basis. In a short period of 2 - 4 years, the air purifier would easily exceed the original cost of the air purifier. On top of it all, to gain the access on air quality monitor/ auto mode feature, one must purchase Blueair Aware monitor (sold separately) which is also an add up cost. If Blueair brand is a must yet you have a smaller budget, consider the alternate smaller Blueair 205 or Winix air purifiers.

Blueair 405 VS The Challengers

Blueair Classic 205

Blueair 205

An even smaller, cheaper version that is catered for medium size room using identical specification and filtration.
Blueair Classic 605 Air Purifier Review

Blueair 605

If money is clearly not an issue, consider this best in class version that has the highest CADR return and purifying coverage.

Final Thoughts On Blueair 405

On the whole, Blueair 405 is a fantastic air purifier with modest airflow delivery rate. Comparing the all round upsides and downsides evaluations, our review has proven the benefits is way more significant than its several flaws. As shown above, you will not bitterly regret choosing it.


  • Wide purifying coverage despite the smaller overall body.
  • Unique HEPASilent Technology setup that electrostatically charge particles first so it will adhere more to the filter.
  • Highly effective gradient structured particle filter and SmokeStop Filter.
  • Consistent airflow with strong dust, pollen and smoke CADR.
  • Durable galvanized steel body that does not leak or release chemicals.
  • Wi-Fi works well with all smartphones supported by the intuitive Blueair Friend app or link it with Amazon Alexa.
  • 5 years manufacture warranty.


  • Cheaper than 605 but still relatively expensive.
  • High annual filter replacement cost.
  • No pre-filter to protects other filters from large particles.
  • No air quality monitoring and Auto mode by default (Requires additional Blueair Aware monitor purchase).
  • Bulky even though its not the biggest unit in its classic range.
Blueair Classic 405

Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.
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