Grease duct joints are held alongside one another via fashioned V clamps and sealed with 3M Fire Barrier 2000+. Reduction in cross-portion: The interior Proportions (width and peak for rectangular ducts, diameter for circular ducts) with the smoke extracting ductwork shall not lower by greater than ten% through the test. https://greasetightextractductwor12234.blogolenta.com/34036007/5-essential-elements-for-grease-tight-extract-ductwork