I just had two different chimney companies come in for an estimate to line my chimney.
My burner (gas) is a convert over from oil.
One chimney guy told me that the old barometric damper on the pipe is dangerous and should be sealed for a gas burner.
The other chimney guy said that the old barometric damper on the pipe is not dangerous, and is necessary to ensure good draft, among other reasons.
Who is correct? These dudes have made me very nervous about Co Monoxide risk all of a sudden.