Fire rated doors are used in buildings to prevent the passage of fire and smoke between two compartments or areas. They are used as a passive means of protecting people and property from fires. Model codes in the United States generally reference NFPA 80: Standard for Fire Doors and Other Opening Protectives when it comes to installation and maintenance of fire doors. Show The International Building Code and International Residential Code require that doors and frames be given a fire-resistance rating after extensive testing by an approved agency. There are a number of testing agencies in the United States, but some well-known agencies that test and certify fire doors include Underwriters Laboratory (UL), Intertek Testing Services (Intertek ETL), and QAI Laboratories, LTD (QAI). Doors are tested following standards, including UL10B, UL10C, ASTM E2074, and NFPA 252. Once tested, the door and frame receive a label that describes the amount of time the component is expected to provide protection when exposed to fire. When combined, all of the components of the door form an assembly that protects the opening. For this reason, all components of the door must include a rating label, including the door panel, the door frame, locksets, gaskets, hinges, and door protection plates. In other cases, the entire assembly (including all hardware) has a single rating. A permanent label is attached to the door panel and the door frame, usually on the hinge side of both. Most other components have a testing agency symbol formed or stamped into the material to identify that the testing agency confirms the components meet the testing requirements.  Local codes should be reviewed, but in general, rated doors must be self-closing and must have a positive latch. There are also limits to the size of glazing in the door, the width of gaps between door panels, the height of the door under-cut, and the size of air transfer grilles. Chart of Door Ratings and LabelsAs mentioned above, doors are labeled based on the amount of time (in hours or minutes) the door is expected to provide protection. Some very old doors may have a letter-rating, which corresponds to the time-based ratings. We include the letters in our chart below for reference, but the time-based ratings should be used on current projects.
** Limited to the maximum area tested Labels D and E were used for exterior doors that are subject to fire hazards from the outside of the door; however, these are no longer used. Temperature-Rise RatingDoors may also have a Temperature-Rise Rating in number of degrees. This represents the expected surface temperature on the unexposed side of the door after 30 minutes of fire exposure. You will see this marked as 250°, 450°, or 650°. Glass included in the door must also meet the temperature rise requirements. S-Label or "Smoke Rating"Many codes require an S-Label for certain doors in some occupancies. For instance, corridor doors often require smoke protection to prevent smoke from leaking from or into an occupied space. An S-label isn't exactly a "smoke rating". Rather, the S-label indicates the door meets the leakage tests that are part of UL 1784: Standard for Air Leakage Tests of Door Assemblies and Other Opening Protectives. However, smoke cannot pass through if air cannot leak through the door assembly. An S-label is usually achieved by installing UL approved gasketing. Required Door Ratings Based on Partition RatingThe required door rating is based on the rating of the partition or barrier that the door is in. The table below provides an overview, but the building code should be referenced due to the complexity involved in determining the rating of the partition and the type of opening allowed. Table 716.5 in the International Building Code provides a detailed list of requirements. Local codes may vary.
* Enclosures for shafts, exit access stairs, exit access ramps, interior exit stairways and ramps, exit passageway walls. Fire Rated Door Field ModificationsField modifications of a fire rated door require specific knowledge of the codes and should be performed by a person qualified to work on rated openings. NFPA 80 provides specific guidance on what can and cannot be done to a rated door. It is important to confirm that all new components have a label that matches the rating of the existing door and frame. In addition, the laboratory that initially approved the assembly must also approve the field modifications in writing per NFPA 80-2019 (5.1.5). Fire Rated Door Annual InspectionIn the United States, NFPA 80-2019 (5.2.4) requires that fire rated doors be inspected each year to confirm that the door is in good condition and that all of the required components work as required. The building owner is responsible for having the inspections done by qualified person and for maintaining proper records of the inspections. Refer to the codes applicable to your specific jurisdiction for label or rating requirements. Article Updated: May 19, 2021 Contributors:
Help make Archtoolbox better for everyone. If you found an error or out of date information in this article (even if it is just a minor typo), please let us know. What is a 20A 20-minute fire-rated door is one that isolates a room during 20 minutes whilst exposed to fire. This kind of door is known as fire-rated EI2-20, and it is useful for places where you want extra protection even though a fire-rating is not demanded. Flame-proof doors usually also have some fire-rating.
What is C label door?C label: 3/4 hour rating (for a 1 hour wall). These doors are used for openings from a corridor into another room in the same building. 1296 square inches of exposed glass is allowed. Louvers can be installed on fire rated doors but they have to be fusible link.
What is an S label on a door?What is an S label on a door? The 'S' mark on a fire door label indicates that the door and frame assembly are in compliance with smoke and draft control per UL 1784 where listed and labeled Category H smoke and draft gasketing is installed.
How thick is a 20Door Thickness: 1-3/4" Thick.
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What label is a 20 minute door?
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