Smacna standards and manuals address all facets of the sheet metal industry from duct construction and installation to air pollution control energy recovery and roofing. Kennedale tx 76060 phone 817 478 0801 fax 817 483 6571 page 6 of 43 sheet metal standards duct guage and enforcing for 1 ess drive heavy ga metal gauge of metal duct dimensions 5 joint 4 joint 2 5 joint 2 joint. 2 500 pa w g.
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