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Long before there was machines to sort out on and competitive sports to keep us moving and before wars were being fought, man didn't think about fitness and health as a technique of keeping healthy. He simply knew that if he didn't hunt, he wouldn't eat of course, if he didn't run, something would hunt him. They were challenging times that focused simply on survival. 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.