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Explanation of Dar Al-Handasah Excel sheet for confining sheet metal in ductwork in a simplified way. Explanation of central air conditioning confinement and sheet metal work. Explanation of sheet metal weight calculation sheet from Dar Al-Handasah. Excel sheet for calculating sheet metal weight, confining insulation work and thickness tables. To download Dar Al-Handasah Excel sheet for confining sheet metal: https://bit.ly/33JpTKJ Dar Al-Handasah Excel sheet password: XZSGTCTWVFTQWJT To download the unit conversion program: https://bit.ly/30jLTtu