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. Benefits of sheet metal properly designed and professionally constructed and installed by experienced contractors sheet metal elements can last for centuries sheet metal fits all green building materials measures especially recycled content recycled content. Ansi smacna 006 2006 hvac duct construction standards metal and flexible sheet metal and air conditioning contractors national association inc. 
				
			
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