The Dyson Pure Cool is its latest air purifier – sorry, air treatment product. And, in typical Dyson style, everything is over-engineered including the price!
That is not to say the Dyson Pure Cool is not worth it, but you must be prepared to join the Dyson clan, and all that entails. What next? A $500 hair dryer or a $1000 vacuum cleaner. These have a $649 and $799 price tag for what effectively is a fan/filter combination that can remove up to 99.95% of airborne fine particles and pollutants.
Why do you need an air purifier?
The air we breathe carries pollutants including sulphur dioxide, carbon monoxide, nitrogen dioxide, ozone, and large (PM10) to small (PM2.5) particulate matter. You can view this on an hourly basis at the NSW Air Quality Data website (or the equivalent site in your state).
I live in the Sydney coast area, and overall its air quality ranges from very good to fair most of the year. In spring PM10 particles kick up as little (causing hay fever and eye irritation) and you have the occasional bushfire that can take the air to very poor or hazardous.
Air pollution is a 21st-century health problem due to traffic, tunnels, construction and local environmental issues. That is where an air purifier can be handy, and there are many fan/filter products – each has a ‘sweet spot’ for use. That may be coverage (measured in CADR – clean air delivery rate), filter types, running costs or even air movement capability (as a fan).
Review: Dyson Pure Cool Desk Fan
There are two Dyson Pure Cool fans – the desk type ($649) as reviewed or the tower style ($799). Apart from the doughnut style desktop (air amplifier in Dyson speak) or flattened oval tower, they do the same. I suspect that most will favour the tower ascetics over the desktop model.
How it purifies
It has a Glass HEPA (high-efficiency particulate air) that captures down to PM2.5 particles. Inside that is an activated carbon filter that can absorb many noxious gasses. Replacement filters are $99 for the pair. There are no specifications for the quantity of active carbon nor both the filters surface areas, so we cannot comment on the efficiency. In comparison to other brands, they appear smaller.
What we can say is that after four weeks of use the test room has noticeably less dust on the furniture.
Dyson recommends the replacement of both filters every 12 months based on 12 hours per day use. If you select continuous monitoring, it can shorten the filter life to 6 months. In practice, the machine will indicate replacement based on air quality and hours of use.
While the Coandă effect means a ‘blown’ air volume of 290 litres per second (maximum fan speed 10) the filtration rate appears to be 10 litres per second – a CADR of 36m3 per hour. That is low, and the impression from the website is that it is for use in a larger area. To do a large open space lounge, you need a CADR of more like 10x – over 300m3 per hour. Website images may lead you to over-estimate its capabilities.
To put that in perspective a smallish bedroom of 3 x 3 x 2.4M is 21.6m3 or 21,600 litres of air. Both devices can turn over the air in about 36 minutes, so it is suited to single rooms where you can close doors and windows.
PS – Dyson are welcome to provide CADR rates for both devices, and we will update this estimate.
Still, in a typical bedroom, it will clean the air and provide enough fan volume for that space.
Fan speed and noise
It has ten speeds. Speed from 1 to 4 are quiet enough to sleep with (use the Auto setting), but from 5 to 10 it ramps up from 55dB to over 65dB (far too loud for sleep)