I am renovating my 1940's house and it has a coal shoot in the basement. The shoot is above grade and has a metal door, but nothing else. We loose a tone of heat to the outdoors in winter through this shoot, so I want to recover it permanently. Anyone have suggestions?
The coal shoot is an 18" by 17" opening in the concrete foundation, with a 45 degree slant on the bottom surface of the opening. The entire opening is lined with rusting metal.