Freddy wrote:Picture 111.31 shows a duct pipe coming out the left side and going up, over the top and going in the right side. The heat doesn't go anywhere! You might as well remove all that pipe and cap the holes.
To move hot air you need a complete smooth circle of moving air..... cold air in from low parts of the rooms that you want to heat, it gets heated, then hot air out, going back to those same rooms, hopefully on the other side of the room from where you took the cold air.
Yeah, I'm kinda hoping there is something else going on there that we can't see in that picture