Fire Rated

The emphasis on life safety and property protection has never been greater than it is today. Doors play a very important role in the fire resistance of a building; they allow people to evacuate safely from a building along with limiting the spread of fire and smoke to other areas.

Fire doors provide the following functions:
  • Provide safe egress from a fire area during a fire
  • Inhibit the fire from spreading throughout the building
  • Protect life and property by reducing smoke hazards
  • Serve as a regular door pathway at all times

Republic provides a comprehensive line of 1 3/8" and 1 3/4" thick labeled doors and frames to meet all requirements for fire protection. All of Republic's door constructions conform to certified fire door procedures whether the doors are furnished with labels or not. Since label requirements vary throughout the country, local authorities having jurisdiction should be consulted during the design and planning stages.

All Republic doors and frames have been fire tested in accordance with UL 10B, UL 10C, UBC 7-2, and ASTM E-152 and are all produced under Underwriters Laboratories and Warnock Hersey/ITS factory inspection and labeling service program.

UL Website Intertek (WH) website

Republic's fire rating capabilities include the use of ceramic glass and special glazing compounds. The following link will take you to Technical Glass Product's FireLite glass technical data specifications which list all of the maximum size limitations along with fire ratings. FireLite glass is listed under Republic's Underwriters Laboratories and Warnock Hersey follow-up programs.

TGP Website
Tech Data (PDF) Tech Data

Fire Rated Technical Data

Basic Fire Door Requirements

Fire door openings are classified by their locations in the building. The location determines the length of exposure protection required, based on the potential fire hazard of that particular area. The six opening classifications are shown below along with the six door ratings and the maximum amount of glass in square inches allowed for each door.

Fire Door Ratings
Label Classification Location in Building Maximum Glass Area
3 Hour Rating 3 hour rated opening (Class A). Openings are in walls separating buildings or dividing a single building into fire areas. Doors for these openings require a fire protection rating of 3 hours. 100 square inches per leaf.
See Note 1
1 1/2 Hour Rating 1 1/2 hour rated opening (Class B). Openings are in enclosures of vertical communication through buildings. These could be stairwells or elevator shafts. While not a means of vertical communication, boiler room doors are generally categorized as Class "B" openings. Doors for these areas require a fire protection rating of 1 1/2 hours and glass areas may not exceed 100 square inches per individual door leaf except as noted below. 100 square inches per leaf.
See Note 2
3/4 Hour Rating 3/4 hour rated opening (Class C). Openings are in corridors and room partitions. Doors for these areas require a fire protection rating of 3/4 hour and the glass area cannot exceed 1296 square inches per light with no dimension exceeding 54 inches except as noted below. 1296 square inches per light. Neither dimension to exceed 54 inches.
See Note 2
1 1/2 Hour Rating 1 1/2 hour rated opening (Class D). Openings are in exterior walls which are subject to severe fire exposure from the outside of the building. Doors for these areas require a fire protection rating of 1 1/2 hours. See Note 3
3/4 Hour Rating 3/4 hour rated opening (Class E). Openings are in exterior walls which are subject to moderate or light fire exposure from the outside of the building. A typical example would be a door leading to an exterior fire escape. Doors for these openings require a fire protection rating of 3/4 hour with glass areas not exceeding 1296 square inches per light with no dimension exceeding 54 inches. 1296 square inches per light. Neither dimension to exceed 54 inches.
See Note 3
20 Minute Rating 20 minute fire rated door frame assemblies are normally found in interior partitions and are intended for installation with 20 minutes fire rated doors of the single swing, swing in pairs, or double egress types. 1296 square inches per light. Neither dimension to exceed 54 inches.
See Note 2
  • Note 1: 100 square inches when using FireLite glass. Neither dimension exceeding 33 inches
  • Note 2: Except when using Pemko fire glazing compound. See U.L. procedure or consult factory
  • Note 3: Consult with local authority having jurisdiction for allowable glass
Types of Fire Door Openings

Republic provides a comprehensive line of 1 3/8 inch and 1 3/4 inch thick labeled doors and frames to meet every requirement for fire protection. The construction conforms to fire door procedure whether the doors are furnished with labels or not. Since label requirements vary throughout the country, local authorities having jurisdiction regarding the use of label opening should be consulted during the design and planning stages.

Underwriters Laboratories (UL)

Doors and frames approved by the Underwriters Laboratories, Inc. have been investigated, fire tested in accordance with UL10B, UL10C, UBC7-2 and ASTM E-152 and produced under the Underwriters Laboratory factory inspection and labeling service program. The attachment of the Underwriters Laboratories Listing or Classification mark indicates that the material has been constructed to comply with the manufacturing specifications as described in the Underwriters Laboratories Follow-Up Service Procedures Program.

Warnock Hersey (WH)

Doors and frames bearing the Warnock Hersey Label have been successfully fire tested in accordance with UL10B, UL10C, UBC7-2 and ASTM E-152. The Warnock Hersey Listing or Classification mark indicates that the material has been constructed to comply with the manufacturing specifications as described in Warnock Hersey's Follow-Up Service Procedures Program.

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