I am in the process of closing in (building walls around) a basement heater room. The room will contain 3 gas heating furnaces (80,000 BTU's each) and
3 gas hot water heaters (30 gallons each -- I don't know the BTU's). The room size will be 8 feet by 7 feet 4 inches, and 8 feet high.
To allow for adequate air in the room for combustion, I was thinking of providing some type of air intake from the outside/exterior of the property. I think the other option would be to have vents in the walls to the adjacent rooms which would allow for more air intake. But, I think the best option may be to have an air intake from the outside.
My question is, are their specific types of vents for this purpose? For example, are there air intake vents that come with dampers that usually stay closed but will open when there is a draw created by the combustion in the furnaces and hot water heaters? Or, are there other ways to approach this so there will be adequate air for combustion for the 3 furnaces and 3 hot water heaters?