Grease duct joints are held together by the use of formed 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 ten% in https://dallastixlz.blogcudinti.com/36988105/grease-tight-extract-ductwork-an-overview