Of SMWIA members, roughly what percent work in HVAC?

• A. 12 percent
• B. 15 percent
• C. 65 percent
• D. 40 percent

Answer: (C)

The main idea here is recognizing how work is distributed in the sheet metal trades: HVAC-related tasks form the largest portion of the field. Duct fabrication, installation, and related components are central daily duties for many SMWIA members, because heating, ventilation, and air conditioning systems require substantial ductwork in almost every building type—commercial, industrial, and residential. That widespread demand makes HVAC the dominant specialty within the membership, so the rough share is about 65 percent. The smaller percentages would imply much less HVAC work than is typical for sheet metal shops and installers, so they don’t fit the real distribution as well.