The room needs 50 cubic foot of free volume for every 1000 btu s input.
Boiler room door vents.
This also means that the cupboard should not be airtight.
The unfinnished area of your basement may give you the volume you need.
The air that s in the cupboard is sufficient for the boiler to do this so long as these clearance measurements are in place.
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The boiler is 125k btu input and the hot water heater in 45k btu input.
So you may be able to just add vents registers through the inside wall to get the combustion air you need.
Or you need to have combustion vents ducts.
Now you need to find the required volume.
The room is approximately 10 x 6.
I want to close these doors.
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.
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.
Lets say you have a boiler room we call it a.
The room does get rather warm during boiler operation but i am most concerned about not having enough combustion air.
There are 3 doors one for my tool room and 2 next to boiler in front of boiler one on the side.
Both the doors have fire guards on them.