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Today's building codes state spaces using furnaces have to have opportinity for creating combustion air because it used. Newer homes have ducting installed, during construction, which brings outdoors externally with an area nearby the furnace. This ducting, usually called make-up air duct, or combustion make-up air, is sized in accordance with the capacity from the furnace. This picture amazingly captures the think layer of clouds over the valley nearby the south of Lake Como, northern Italy. In the above image, the dense cloud hides almost the valley leaving some artificial lights that will make the location like an opaque blanket. The village over distance is clearly seen out from the blanket.