Help! I paid a local Anchorage company (Alaska Chimney Sweep) to install my new fireplace insert because Allstate told me it had to be professionally done to be covered. After paying $900+, the installer told me she would get her "sheet metal guy" to fab a part to cover the old stove pipe hole. Long story short the company went out of business and I am being ignored. The old pipe is 16" and the new one is 6". I was hoping to find a reducer, but nobody makes one that size. Any ideas on what I could do to cover this hole? I would think it needs to be on an incline to shed water. Thanks for any help.