Electric chimney is placed about 30 inches above the burner and burners are not in the centre of the chimney hood. When blast of fumes comes while cooking ’’paratha’’, ’’dosa’’ etc., part of the fumes escape the effective zone of the chimney hood and get collected near to the ceiling. The escaped fumes now cannot be evacuated by chimney. Further, if you run chimney at lower speed it is not effective, and if you run it at full speed then the chimney is very noisy and you can hardly talk while chimney is in operation. Functionally, an exhaust fan located near to the ceiling does a much better job and it requires practically no maintenance as compared to chimney.