Condition...~85k cast iron hot water nat gas. boiler in a basement oversized boiler room that is heated only by lost heat in piping and the boiler itself. The boiler is seldom used except on the coldest days (Pac. NW, pretty mild climate) as the client uses mostly wood stove.
The boiler is equipped with a motorized stack damper above the draft hood to keep cold air from running through the boiler while idle. Combustion air is provided to the room from a 10”x10” hole in the rim joist directly into the room. My question is this. Is there any advantage to installing a duct from the air inlet to direct air directly to the mouth of the boiler, and secondly is there some merit in adding a furnace controlled stack damper to shut the air off when the burner is not calling for heat, reducing cold air infiltration to the boiler room (and the house).
Finally, can I accomplish this simply by adding a barometric damper to the intake duct, such that it would only open then the room experiences negative pressure. (The boiler room is quite large, several hundred square feet, and the house is ~100+ years old so I don’t believe the boiler would ever be starved for air.
Any advice appreciated. Thanks
Icarus
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