Grease duct joints are held jointly by way of shaped V clamps and sealed with 3M Fire Barrier 2000+. Reduction in cross-part: The inner Proportions (width and height for rectangular ducts, diameter for circular ducts) on the smoke extracting ductwork shall not minimize by greater than ten% in the exam. https://greasetightextractductwor45677.ageeksblog.com/35639330/what-does-fire-resisting-ductwork-insulation-mean