Access panels shall be made of the same material and thickness as the duct. Which option presents the correct pairing?

Access panels shall be made of the same material and thickness as the duct. Which option presents the correct pairing?

• A. Color and finish
• B. Width and height
• C. Material and thickness
• D. Temperature rating

Answer: (C)

The key idea is that access panels in ductwork must match the duct’s fire performance. If the panel uses a different material or a thinner construction, it can become a weaker point that fails sooner in a fire, allowing flame or smoke to penetrate and compromising the duct’s overall fire resistance. Matching both material and thickness ensures the panel shares the same thermal properties, strength, and expansion behavior as the duct, so the assembly remains continuous and protective during a fire and through normal service. Therefore, the correct pairing is material and thickness. Color/finish, width/height, or a separate temperature rating don’t ensure the panel maintains the same fire performance as the duct.

The key idea is that access panels in ductwork must match the duct’s fire performance. If the panel uses a different material or a thinner construction, it can become a weaker point that fails sooner in a fire, allowing flame or smoke to penetrate and compromising the duct’s overall fire resistance. Matching both material and thickness ensures the panel shares the same thermal properties, strength, and expansion behavior as the duct, so the assembly remains continuous and protective during a fire and through normal service.

Therefore, the correct pairing is material and thickness. Color/finish, width/height, or a separate temperature rating don’t ensure the panel maintains the same fire performance as the duct.