Where a frame bears a recognized label qualifying it as a fire door frame without an indicated rating, it may support a 3-hour, a 1-1/2-hour, 1-hour, a 3/4-hour, 1/3-hour, or a 20 minute door. Some state and local building codes may require hourly ratings to be indicated on the certification label. Frames used in masonry walls may be used with a maximum 3-hour fire door, while frames used in drywall stud walls are intended to be used with a maximum 1-½-hour fire door. Consult individual fire door frame manufacturers listings for fire door frames that can be used in drywall stud walls with a maximum 3-hour rating.
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