I want to close these doors.
Boiler room door vents.
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.
Both the doors have fire guards on them.
There are 3 doors one for my tool room and 2 next to boiler in front of boiler one on the side.
The boiler and wh located there and room b is the open basement space.
Or you need to have combustion vents ducts.
The unfinnished area of your basement may give you the volume you need.
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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.
This also means that the cupboard should not be airtight.
So you may be able to just add vents registers through the inside wall to get the combustion air you need.
The room is approximately 10 x 6.
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.
I keep the doors next to the boiler open at all times.
The boiler is 125k btu input and the hot water heater in 45k btu input.
The room needs 50 cubic foot of free volume for every 1000 btu s input.