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Bridal consultant training can be done locally at an adult education center or through a city's recreational programs. There are also wedding planner distant learning courses available. Examples include those offered by the U.S. Career Institute or the Penn Foster Career School. 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.