Smacna mid atlantic chapter is a non profit trade association comprised of sheet metal contractor members and associate members who concentrate their collective efforts on the needs and promotion of the sheet metal industry. One of our main purposes is to implement high standards of work within the industry. 2 hvac duct construction standards metal and flexible 1st edition 1985 hvac duct construction standard metal and flexible 2nd edition 1995 and the current smacna duct construction standard hvac duct construction standards metal and flexible 3rd edition 2005.
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