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Today's building codes state spaces using furnaces have to have method for getting back together combustion air since it used. Newer homes have ducting installed, during construction, that literally brings fresh air from the outside for an area close to the furnace. This ducting, usually called comprise air duct, or combustion make-up air, is sized according to the capacity from the furnace. In terms of its specifications, Vette's V8 will need a stride or two for the downsizing road, providing a smaller displacement. GM has confirmed the latest units will feature tiotioaluminum blocks and heads, direct injection and also an efficiency-boosting combustion system. However, the upcoming powerplants will stay GM's overhead-valve design, which ensures you keep the development costs low and offers a compact layout. Also, Vette will have a capacity of 5.5 liters and definately will generate about 440 hp.