Association of union sheet metal contractors

• A. ITI
• B. SMACNA
• C. SMWIA
• D. NECA

Answer: (B)

In sheet metal trades, there are unions that represent workers and contractor associations that represent the companies that hire those workers. The association of sheet metal contractors is SMACNA, which stands for Sheet Metal and Air Conditioning Contractors' National Association. It serves contractor members by publishing standards and best practices for ductwork and HVAC installation, plus training and safety resources to help contractors deliver consistent, quality work. This distinguishes it from the workers’ union (SMWIA) and from other groups like NECA (electrical contractors) or ITI (a training institute not specific to sheet metal contractor work).