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The vents on the stair risers are there for air circulation to the basement of the Monty as the basement area is heated similarily to the balance of the living space upstairs. I would think this is return air and at least a balance of the air and heat that is displaced in the Monty in total. I am not able to verify if some of this air returns to be combusted which would be combined with outside air. I would not block this area off with a first priority of having heated air balance between the basement and the living space.
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