1 year ago I bought this chimney. When I use this, I feel headache because it is noisy chimney. And I have very bad experience About it. This chimney is very noisy you couldn't on it more then Five minutes and this is not good for our health. The dealer said that it is automatic chimney, so when you use the mode you have to face some noise, but it was a very noisy chimney Compare to other chimneys. It doesn't save electricity compare to another chimney. It is a very irritating sound.I'm tired by this chimney. So I exchange this chimney to another chimney.