Wonderful put up Alison! While we like sheet steel, specifically for trunk strains, massive duct systems is usually exorbitantly high priced if completed in all steel. There are times where by flex duct (or sections of it) might help to scale back expenses. Inside our retrofit perform, we’d instead see https://bookmarktune.com/story17992500/top-guidelines-of-fire-resistant-ductwork-installers