Which statement correctly describes the listing requirement for fire dampers in listed exhaust hood systems?

• A. The fire damper shall be listed for such use or be part of a listed exhaust hood with or without exhaust damper
• B. It must be listed separately
• C. It can be unlisted if hood is listed
• D. It is not required to be listed

Answer: (A)

In listed exhaust hood systems, a fire damper must have an approved listing for the specific use in such installations, or it must be part of a listed exhaust hood assembly. This means the damper itself is tested and documented as suitable for use with exhaust hoods, or the hood plus damper configuration is a listed unit. The listing ensures the damper will operate correctly and maintain the system’s fire containment when exposed to heat, whether the hood includes the damper or relies on a separately listed damper that’s approved for use with a listed hood. Using unlisted dampers or unlisted configurations would not meet the required fire-protection standard.