Grease duct joints are held jointly by means of shaped V clamps and sealed with 3M Fire Barrier 2000+. Reduction in cross-area: The internal Proportions (width and height for rectangular ducts, diameter for round ducts) in the smoke extracting ductwork shall not decrease by much more than 10% during the https://grease-tight-extract-duct12233.ourcodeblog.com/37284706/getting-my-grease-tight-extract-ductwork-to-work