Grease duct is either routed via a hearth rated shaft enclosure or wrapped with the accepted fire insulating blanket which allows for zero clearances, for instance that made by 3M. However, your browser isn't supported. You should down load just one of those browsers for the very best working experience https://kylerfxmap.digitollblog.com/36761138/fascination-about-grease-tight-extract-ductwork