Glenn Herbert wrote:It is always considered a very bad idea, and prohibited by code, to connect two appliances to one chimney. Draft can be unreliable, and one may have a bad effect on the functioning of the other.
Baxter Tidwell wrote:
Fresh air is no problem, unfortunately. The shop is three 40-ft steel shipping containers welded together. It is very difficult to get everything air-tight, especially around doors and windows. There's always a draft somewhere.
But that's not a problem because it's a workshop, and you'd expect it to be drafty. Maybe this winter I'll want to seal it up a bit more if it's uncomfortable. If that causes a constriction in airflow, perhaps I can punch a hole in the outside wall next to the heater core and let in some fresh air. I'll figure it out as I go along.