How many square feet is this rated for?
Dyson doesn’t seem to state that. On their product page, there’s a footnote that their stats are from a test room of 290 sqft.
Got one for my home office. I love the auto feature. It comes on automatically when I vaped in there. So cool. Made me a believer of the Dyson fans. Buying another for the bedroom
Mine showed up today DOA. 
Same 
Mine is also unresponsive. What the heck
Just letting everyone interested know that I purchased Dyson cool purifier fan actually 3 of them last week only took a few day’s to get them and all 3 were packaged very nicely and looked and smell brand new I only had a problem with 1 remote so I called Dyson and they are sending a new remote. I’m so happy my teenage son’s room actually smells good after only 2 days with 1 in his room. I bought 3 and if I could I would buy more this Dyson air purifier fan is great. I am just a regular deal shopper and this is a big deal. These things are expensive so happy with my purchase.
Mine also arrived DOA
I was able to hard reset mine and now it worked, posting to hopefully help you guys.
- unplug
- hold power button down (keep holding)
- plug in (keep holding button)
- wait like 20 seconds for flashing lights / reset
- let go of power button
This 100% fixed mine and it works as expected. Hope this works for you too.
Check below, try a hard reboot , it fixed mine.