This item was purchased about 8-9 years ago, so it's old, but I've confirmed that it works. I haven't used it in the last 6-7 years, so I'm putting it up for sale. I think it can still be used for a long time if you replace the unit. There are some minor scratches on the surface, so please check the photos. The filter has been cleaned, but it's been stored by an amateur, so I would appreciate it if you could clean it again upon arrival. Recommended for people with hay fever and smokers! Thank you.