B the product contains data which is believed by smacna to beaccurate and correct but the data including all information ideas and expressions therein is provided strictly as is with all. Representing sheet metal and air conditioning contractors from maryland virginia washington d c. 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.
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