have a 16 section hot water boiler operating in a boiler room that has poor ventilation
so bad that boiler has trouble bringing up heat of the water when burner is firing. when the boiler room door is opened , air flow dramatically improves and boiler heating improves.
is there any harm being done to boiler by depriving the burner of good ventilation.
seems that it might be stressful along with inefficient performance
there is a window with an exhaust fan but its left off most of time.