Which of the following is an approved procedure for commercial duct design per the 2018 NCMC?

• A. SMACNA Guidelines
• B. ASHRAE Handbook of Fundamentals
• C. CAGI Standards
• D. NFPA Regulations

Answer: (B)

The ASHRAE Handbook of Fundamentals is recognized as an approved procedure for commercial duct design according to the 2018 North Carolina Mechanical Code (NCMC). This handbook provides essential information on heating, ventilation, and air conditioning systems, including detailed guidance on the design and sizing of duct systems to ensure efficiency and performance.

It includes fundamental principles of heat transfer, fluid flow, and various factors that influence the design process, making it a crucial reference for HVAC professionals involved in duct design. Utilizing ASHRAE standards helps ensure that systems are designed to meet energy efficiency, comfort, and safety standards as outlined in the NCMC.

The other options, while important in their respective fields, do not specifically address duct design according to the criteria set by the NCMC. SMACNA Guidelines focus on construction and installation practices, CAGI Standards are more related to air quality and equipment, and NFPA Regulations primarily deal with fire protection and safety standards rather than duct design metrics.