Grease duct is possibly routed via a hearth rated shaft enclosure or wrapped by having an permitted fireplace insulating blanket that enables for zero clearances, like that produced by 3M. Duct installation needs a clear length from combustible elements. NFPA ninety six mandates that duct accessibility doorways be mounted at https://grease-tight-extract-duct90112.gynoblog.com/35878483/about-grease-tight-extract-ductwork