Yes, one of the bloggers I follow compared them to the PC fan boxes. They look very expensive, though the CADR/size and noise are fine.
My guess is Dyson’s design is particularly bad. No way to get lots of filter area when most of the purifier is a huge bladeless fan. No idea about the other one, maybe you have air leaking in or an indoor source of PM.
Yes, one of the bloggers I follow compared them to the PC fan boxes. They look very expensive, though the CADR/size and noise are fine.
My guess is Dyson’s design is particularly bad. No way to get lots of filter area when most of the purifier is a huge bladeless fan. No idea about the other one, maybe you have air leaking in or an indoor source of PM.