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Blueair 503 HepaSilent Air Purifier

The Blueair 503 air purifier is produced with the latest achievements in the field of medical engineering. It made its debut in the market back in 2009 as a more technological replacement for the older 501 model. It combines mechanical means with purification methods based on the use of electricity to produce crystal clean air in a household or office environment. The patented technologies allow this device to capture up to 99.97% of harmful airborne particle as little as 0.1 microns. It will effectively process air in premises up to 580 sq. ft. However keep in mind that it was built to remove particles from the air and might not be as effective when it comes to odors.
Let’s take a closer look at this model and find out more about the way it operates and how it can be useful in a household or office.

How Does Blue Air 503 Work

The cleaning cycle for the Blueair Classic 503 model is composed of the following steps:
  • The air is sucked into the unit from every side and the bottom.
  • The current is processed by the HEPASilent filter and cleared of airborne particles.
  • The flow goes into the ionizing chamber where it is charged with negative ions.
  • The clean air is then released back into the room.
Blueair 503 HEPAsilent air purification system produces very little noise. In fact it is one of the leaders of the market in terms of how quiet it can operate. This is achieved by a combination of high precision engineering that minimizes the friction between moving parts and use of materials with low vibration rates. For instance, the casing is built of high grade steel that muffles the sound unlike plastic that is rather popular in the industry because of its low cost.
SurroundAir ventilation system provides outstanding cleaning rate – over 400 cubic ft. a minute. On top of that the purified air is evenly spread across the premises thus ensuring efficient circulation.
The trademark HEPASilent tech is the solution that makes it possible to capture almost every single particle in the air. These results are produced by combining several layers of fabric and ionizing the stream. The efficiency is equally high on every speed mode.

Special features

The cleaning cycle for the Blueair Classic 503 model is composed of the following steps:
  • A timer that can be programmed to fit your schedule;
  • Filter indicator which allows to understand its remaining term of service easily;
  • Almost non-existent ozone emission.
What is more the device has earned Energy Star Certification which means it’s environmental friendly and has low energy consumption rates.
One of the few drawbacks of the Blueair 503 model is that it has no prefilter. This is by no means an omission – rather a solution that allows to improve the clean air delivery rate (further referred to as CADR). But at the same time it means that the filter will capture all the particles. Thus the term of service will be subsequently reduced due to higher workload and you’ll have to replace it more often than the purifier usually require. As a result the only significant downside of the device is that it requires relatively expensive filter replacement.


A big advantage of this air purifier is that you don’t need to monitor it on a constant basis. Just plug it in and select the speed mode – that’s it. A blue light will indicate the unit is on and working. You won’t have to do filter cleaning on a weekly basis either. The steel casing is easily wiped of dust and won’t accumulate dirt on its surface.
All you need is to replace the filter twice a year. Just simply pull out the old one and install a new one. You don’t need to remove any screws or to use sophisticated tools for this procedure. Please keep in mind that dust will gradually be accumulated inside the air purifier. It means you have to vacuum it thoroughly when install a new filter.
The Blueair 503 air purifier can be equipped with a SmokeStop carbon filter that deals with unpleasant chemical odors. Note, it should be a component designed specifically for this model. Otherwise CADR may be reduced significantly.


The Blueair Classic 503 is a strong contender in the premium segment of air purifiers. It is not cheap but you get solid value for the price. We would definitely recommend this air purification system for home use.
Blueair 503 HepaSilent Air Purifier
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