Blueair 603 vs 605… it’s time for another air purifier comparison report! This time, it’s between two models from Blueair’s Classic line. Which one should you choose? Knowing the areas they differ in helps you make a decision.

Comparison Chart: Blueair 603 vs 605

Blueair Classic Air Purifier
Model Check Price » Blueair 603 Check Price » Blueair 605
Room size 65 sq. m. (698 sq. ft.) 72 sq. m. (775 sq. ft.)
CADR (Smoke, Dust, Pollen) 450, 450, 450 CFM 500, 500, 640 CFM
Air changes per hour 5 5
Dimensions (H x W x D) 660 x 500 x 340 mm (26 x 20 x 13 in) 660 x 500 x 340 mm (26 x 20 x 13 in)
Product weight 16 kg (35 lb) 14 kg (31 lb)
Sound level 32 – 66 dB(A) 32 – 62 dB(A)
Speed control options 1 – 2 – 3 – 4 1 – 2 – 3
Filter replacement indicator ✅ ✅
Remote via Blueair Friend App ❌ ✅
On/off timer ❌ ✅

Key Differences


Check Price » Blueair 605

You’ve seen the comparison chart above. Notice their differences? We list them down here.

Coverage Area

Which of these Blueair air purifiers has a larger coverage area?

It’s the Classic 605, which is able to purify large rooms of up to 775 sq. ft. On the other hand, the Blueair Classic 603 isn’t far behind. According to the data we’ve collected, it’s able to cover a room of up to 698 sq. ft.

CADR Rating

An air purifier’s CADR rating tells you how fast the device filters out impurities from the air. The higher the number, the better the air purifier.

Which one has a higher CADR rating? It’s the Blueair Classic 605.

Weight and Noise

The Blueair Classic 605 is lighter, weighing 31 lbs. (or 14 kg). This is 4 lbs. lighter than the Classic 603, which weighs 35 lbs.

When it comes to noise, the Blueair Classic 605 can produce 62 dB at the highest setting. It’s slightly lower than the 66-dB rating of the Classic 603.

Blueair Friend App

The Blueair Friend app allows you to control the air purifier using your smartphone. The Blueair Classic 605 is not only Wifi-enabled but it’s also Alexa-compatible.

Unfortunately, the Blueair 603 doesn’t have this feature.

Also read: Blueair 505 vs 605: Which Air Purifier is Better?

Our Final Word: Blueair 603 vs 605

So… which of these two Blueair air purifiers should you buy? Here’s our final say.

Get the Blueair Classic 605. Not only does it have a larger coverage area (up to 775 sq. ft.), but it also has better features. It has a better CADR rating, it’s less noisier, it’s lighter, and it can be controlled from your smartphone via the Blueair Friend app.


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