Located in headquarters outside washington d c the sheet metal and air conditioning contractors national association smacna an international association of union contractors has 1 834 members in 103 chapters throughout the united states canada australia and brazil. 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. Welcome located in surrey british columbia the british columbia sheet metal association smacna bc is one of the leading construction associations in british columbia.
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