There are lots of authorised methods of earning a welded joint for grease exhaust ductwork. The alternatives will depend on the code on your jurisdiction but should incorporate flanged, telescoping, Bell type or overlapping joints. If the outlet terminates at a degree that isn't commonly accessible, it ought to be https://fire-resisting-ductwork-i90112.blogcudinti.com/37194660/fire-resisting-ductwork-insulation-an-overview