Grease duct joints are held together by the use of formed V clamps and sealed with 3M Fire Barrier 2000+. Reduction in cross-part: The internal Proportions (width and height for rectangular ducts, diameter for circular ducts) with the smoke extracting ductwork shall not minimize by more than 10% in the https://grease-tight-extract-duct23344.bloggazzo.com/35766072/detailed-notes-on-grease-tight-extract-ductwork