Grease duct joints are held with each other via shaped V clamps and sealed with 3M Fire Barrier 2000+. Reduction in cross-part: The internal Proportions (width and height for rectangular ducts, diameter for round ducts) in the smoke extracting ductwork shall not decrease by in excess of 10% in the https://air-conditioning-engineer35677.blogdiloz.com/35804838/not-known-factual-statements-about-grease-tight-extract-ductwork