The air that s in the cupboard is sufficient for the boiler to do this so long as these clearance measurements are in place.
Boiler room door vents.
I want to close these doors.
Or you need to have combustion vents ducts.
There are 3 doors one for my tool room and 2 next to boiler in front of boiler one on the side.
The room does get rather warm during boiler operation but i am most concerned about not having enough combustion air.
I keep the doors next to the boiler open at all times.
Now you need to find the required volume.
The space does have a basement window and the room is not air tight i also have also added a vent to the rest of the basement with a standard ac return vent.
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The boiler and wh located there and room b is the open basement space.
Lets say input rating of your boiler is 110 000 btu and your wh is 40 000 btu total rating in room a is 150 000 btu.
Although the boiler cupboard does not require any form of air vents or additional ventilation the boiler requires oxygen in order to burn the gas correctly.
The unfinnished area of your basement may give you the volume you need.
The boiler is 125k btu input and the hot water heater in 45k btu input.
Both the doors have fire guards on them.
Lets say you have a boiler room we call it a.
The room is approximately 10 x 6.