furnace date for Air ease?

Anybody help me with the date of this Air Ease furnace date?
Serial # 8400m11991


1991 or 1984 right? What year was the home built?

December 2000



That’s what I was looking at but questioned the 84th week?

There is a bad link at Buildingcenter.org. I have already reported it to Dale and Will.

I posted the correct information below. December 2000.

Thanks Stephen