I suffer from respiratory problems and was looking online for suitable air purifiers. I came across Clair air purifiers on this website and found the literature and videos very interesting since these purifiers weren't just HEPA but had patented e2f technology. South Korean brands are known to be technology smart and after going through the patent and test certificates I was convinced this air purifier suits my need as it had the ability to capture airborne particles which were as small as 0.1 microns (something which most of the present day HEPA filters are incapable of doing) and I also liked the fact that it was very aesthetically designed and claimed to have a good filter life of 18 months. I went ahead and ordered one.The product was delivered within a week's time and they had someone answer all the queries I had in mind. I am particularly happy with their service and prompt response to my queries. I only wish they had more visibility in the market so that prospective customers like me can benefit from their innovative product that's the reason I thought of writing this review.