Listed exhaust hoods with or without exhaust dampers shall be permitted to be constructed of materials required by the ______.

• A. Code
• B. Certification
• C. Listing
• D. Listing Requirements

Answer: (C)

The governing idea is that listed exhaust hoods are constrained by what the listing itself allows. When an exhaust hood (with or without dampers) is listed, the listing document from a recognized testing laboratory specifies exactly which materials may be used in its construction. That listing becomes the authoritative source for material compatibility and fire-safety performance, so only those materials named in the listing are permitted.

That’s why the correct answer is listing. A general code or certification doesn’t pin down the exact materials to be used in a listed product, and “listing requirements” is not the formal term used. The presence of dampers doesn’t change the material requirement—the listing covers both configurations and dictates the acceptable materials for the hood. For example, if the listing specifies stainless steel and certain coatings, substituting a material not named in the listing would not be allowed.