Fire Doors, GSNV

Guide Information for Fire Resistance Ratings



This category covers fire doors certified in the following categories: Access, bullet-resisting, chute, curtain, dumbwaiter, freight elevator, passenger elevator, rolling steel, service counter, sliding, special purpose, swinging, and swinging, positive-pressure-tested doors.

Fire doors are intended for installation in conjunction with fire door frames, hardware, and/or other accessories that together form a fire door assembly, which provides the degree of fire protection to the opening. For certifications of fire doors, see:

Access-type Fire Doors (GSOT)
Bullet-resisting-type Fire Doors (GSOX)
Chute-type Fire Doors (GSPR)
Curtain-type Fire Doors (GSQX)
Dumbwaiter-type Fire Doors (GSRV)
Freight-elevator-type Fire Doors (GSST)
Freight-elevator-type Fire Door Retrofit Parts (GSSZ)
Passenger-elevator-type Fire Doors (GSUX)
Rolling Steel Fire Doors (GSVV)
Service-counter-type Fire Doors (GSWT)
Sliding-type Fire Doors (GSXV)
Special-purpose Fire Doors (GSXZ)
Swinging-type Fire Doors (GSYX)
Finishers of Fire Doors (GSZC)
Swinging-type Fire Door Retrofit Parts (GSZG)
Swinging-type Fire Doors, Positive-pressure Tested (GSZN)

Fire doors are designed for the protection of openings in walls and partitions against fire when installed in accordance with ANSI/NFPA 80, "Fire Doors and Other Opening Protectives."

The rating of 4-, 3-, 1-1/2-, 1-, 3/4-h, 30 or 20 minutes indicates the duration of exposure to fire. As indicated in the individual certifications, some manufacturers can furnish sliding- and swinging-type doors that are Classified for 4 hours.

Classification Marks with 3 h ratings have replaced the "Fire Door for Opening in Fire Wall" and "A" Classification Marks; the 1-1/2 h and 1 h Classification Marks have replaced the "Fire Door for Opening in Vertical Shaft" and "B" Classification Marks; the 3/4 h Classification Marks have replaced the "Corridor and Room Partition" and "C" Classification Marks; the 1-1/2 h Classification Marks have also replaced the "Fire Door for Opening in Exterior Wall," the "Fire Shutter for Opening in Exterior Wall" and the "D" Classification Marks; the 3/4 h Classification Marks have replaced the "Fire Door for Opening to Exterior Fire Escape" and "E" Classification Marks.

Some fire doors contain a temperature-rise rating in the Classification Mark. This rating is intended for use in determining compliance with the temperature-rise requirements contained in the "International Building Code," ANSI/NFPA 101, "Life Safety Code," and/or ANSI/NFPA 5000, "Building Construction and Safety Code." A temperature-rise rating of 250°F, 450°F or 650°F applies to the temperature rise developed on the unexposed surface of the door after the first 30 min of fire exposure. Classification Marks that do not indicate a temperature rise are for doors which develop a temperature rise in excess of 650°F on the unexposed surface of the door. All doors with glass lights in excess of 100 sq in. are not eligible for a temperature-rise rating. Doors with glass light panels of 100 sq in. or less carry the same rating as similar doors without glass vision panels.

Glazing materials covered under this category are Classified as to fire resistance only. The glazing materials are intended to be installed in the fire doors in accordance with ANSI/NFPA 80 and the installation instructions provided by the manufacturer of the door, glass light frame or glazing material. See Fire Door Glass Light Frames (GVVX) and Fire-protection-rated Glazing Materials (KCMZ).

A door prepared at the factory for a glass light includes the glazing members (frame) but normally does not include the glazing itself. Glazing materials are usually provided by other than the door manufacturer and installed at the time of the door installation.

The protection of an opening depends not only upon the use of fire doors, but also upon the use of Listed door frames and other Listed accessories as specified under each door type. Prospective users should first ascertain from Authorities Having Jurisdiction which door type, mounting, Listed hardware, Listed door frame, and Listed closing mechanism are acceptable for a specific location.

While doors of the freight elevator type, rolling steel type, and sliding or swinging steel-covered composite type, hollow-metal type, metal-clad (Kalamein) type, sheet-metal type and tin-clad type exceeding the sizes recorded in the tabulations under their respective types have not been subjected to fire tests, a Certificate for Oversized Fire Door can be provided for door assemblies in compliance (except for size), with all requirements for design, materials and construction. The Oversize Certificate can be a separate certificate or a label certificate affixed to the door assembly.

Similarly, an attached or separate Certificate for Passenger Elevator Fire Door Frame Assemblies incorporating a transom panel can be provided when such frame/transom panel assemblies, designed for use with specific Classified Passenger Elevator Fire Doors and Listed Passenger Elevator Fire Door Hardware, exceed the maximum heights which have been subjected to Standard Fire Tests. As with the oversize doors described above, prospective users should first ascertain from the Authority Having Jurisdiction whether the oversize frame assembly is acceptable for any given location.

Authorities Having Jurisdiction should be consulted as to the particular requirements covering the installation and use of these products.


To assist in selecting components of fire door assemblies tested under positive pressure, eight categories, identified as A through J, were established.

Category A Doors — A fire door that does not require the addition of other components such as edge seals to comply with positive-pressure requirements. It also includes doors that have been prepared with edge seals in the manufacturing process. See Swinging-type Fire Doors, Positive-pressure Tested (GSZN) for the individual certifications.

Category B Doors — A fire door that requires the addition of an edge seal to comply with the positive-pressure requirements. The edge seals are added to the door edge or to the frame. See Swinging-type Fire Doors, Positive-pressure Tested (GSZN) for the individual door certifications. See Gasketing and Edge-sealing Materials for Fire Doors, Positive-pressure Tested (GVYI) for the Category G Edge Sealing Systems individual certifications.

Category C Frames — A fire door frame that plays an integral part in the door assembly in complying with the positive-pressure requirements. Three-sided hollow metal frames are generally not required to be positive-pressure tested. See Fire Door and Window Frames (GVTV) for a listing of those manufacturers that can provide steel frames.

Category D Door/Frame Assemblies — A door and frame assembly that is labeled as assembly. Category D door and frame assemblies are Listed under Special-purpose Fire Doors (GSXZ).

Category F Light Kits — Light kits that have been investigated for positive pressure. See Fire Door Glass Light Frames (GVVX) for the Listings of the positive-pressure glass light frames investigated to positive pressure.

Category G Edge Sealing Systems — Edge seals that are surface applied to frames or doors. These seals may or may not have an effect on meeting the leakage requirements for the smoke ("S") rating. See Gasketing and Edge-sealing Materials for Fire Doors, Positive-pressure Tested (GVYI) for the Category G Edge Sealing Systems individual certifications.

Category H Smoke and Draft Control Gasketing — See Gasketing and Edge-sealing Materials for Fire Doors, Positive-pressure Tested (GVYI) for the Category H Smoke and Draft Control Gasketing for the individual certifications.

Category J Gaskets — Gasketing materials that are added to a door assembly for purposes other than Category G Edge Seals and Category H Smoke and Draft Control Gaskets. They are used for purposes such as weather stripping and for sound control. They meet the requirements for positive-pressure tests and can be used on these assemblies. These gasket materials do not contribute to the doors meeting the positive-pressure fire test. They are only investigated so that they do not contribute to flaming when tested to the positive-pressure-test requirements.


For information on fire doors, fire windows, and related frames, hardware, glazing and other individual components, see Fire Door Assemblies and Window Assemblies (GSNN).

For the protection of paper records against loss by fire, see Vault Doors, Class 350, Insulated (RZNR) and File Room Doors, Class 350, Insulated (RWWR).

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Last Updated on 2012-10-08
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