This is a fairly cheap unit at $129 – does the job but even on low it is quite loud compared to units such as the “Mi Air Purifier”. Had they given it a ‘quiet; setting it would be better in my opinion.
When I bought it there was zero information on the Internet about it, but now the manual has shown up at http://www.stirlingappliances.com.au/LiteratureRetrieve.aspx?ID=195680
Still no idea where to get replacement filters – but really there isn’t much complexity to this product and you can probably make your own.
Video of the product: https://www.youtube.com/watch?v=HMCpbbrqnXA (Recorded in Portrait)