The F rating for a framed wall/stud wall is ________ hour(s).

A one-hour F rating is below the required standard for framed or stud wall assemblies, which demand a two-hour rating to match the wall's fire-resistance classification.

A firestop system installed in a framed or stud wall must achieve an F rating equal to the fire-resistance rating of the surrounding wall assembly, which for standard framed or stud construction is two hours. This ensures that the penetration seal does not create a weak point that would allow flame passage before the wall itself fails. The two-hour F rating is tested per standardized fire exposure methods and must be achieved for the firestop to be considered code-compliant for that wall type.

A three-hour F rating exceeds the requirement for framed or stud wall construction and applies to higher-rated assemblies such as heavier concrete or masonry walls.

A four-hour F rating is designated for the highest fire-resistance wall assemblies, such as reinforced concrete, and is not applicable to standard framed or stud wall construction.