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I found this book, and the entire Earth Life Series, to become powerfully transformative. Written simply and lovingly, these teachings ring as true today since they did at publication in 1986. These are the same truths every master from every era taught, updated for the modern time. They deal specifically because of the everyday thoughts and circumstances we face now. 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.