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Today's building codes state spaces using furnaces will need to have means for getting together again combustion air as it used. Newer homes have ducting installed, during construction, thats liable to bring oxygen on the surface to a area close to the furnace. This ducting, usually called constitute air duct, or combustion make-up air, is sized according to the capacity in the furnace. Before going into battle a soldier needs to prepare. To wear the proper armour and get hold of a shield and sword. The armour protects from harm as well as the sword kills the not so good guy. You also have to be fighting fit. It's the same if you battle against yourself. You need protection from dangerous illusions and also to be equipped with right knowledge and understanding.