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Founded in 2006, Fenster is one of the West Country’s leading aluminium suppliers. In addition to offering the full range of products from Smarts, the company also manufactures Üni_Slide, an ultra-slim aluminium sliding door, equally suited to commercial and residential applications. 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.