[Record-protection Devices] Vault Doors, Class 350, Insulated, RZNR

See General Information for Record-protection Devices


This category covers insulated vault doors consisting of an assembly of insulated doors, single or in pairs, closing into and interlocking with an insulated frame and equipped with latches or bolts, a locking mechanism. These doors are effective in withstanding:

1. A standardized fire of controlled extent and severity for at least: 2 hrs (reaching 1850°F), or 4 hrs (reaching 2000°F), or 6 hrs (reaching 2150°F) without exceeding an interior temperature of 350°F during or after the fire exposure, 2 in. from the unexposed face of the door in a plane of each side door joint, 6 in. down from top door joint and in a plane of the top door joint at its middle, when installed in accordance with the manufacturer's instructions.
2. Application of a standard hose stream, for 1 min and reheat for 1/2 of the classification period, without destroying the usability of paper records stored in the vault.

Insulated vault doors are intended to be installed in fire-resistive vaults constructed as specified in ANSI/NFPA 232, "Protection of Records." A vault is a fire-resistive enclosure constructed as to provide both fire resistance and structural stability and it may be located in fire-resistive or non-fire-resistive buildings. Vaults are used exclusively for storage with no work to be carried on in the vault.

Vaults are intended to be equipped with insulated doors having a fire resistance at least equal to the hourly rating of the vault walls.

The Certification Mark on these doors covers the assembly consisting of the door, frame and hardware, and it designates the hourly fire rating. The protection of the opening depends upon proper installation of all parts as specified in the manufacturer's instructions.


The following product identity appears on the product:

    Insulated Vault Door, Class 350


For additional information, see Record-protection Devices (RWIT) and Fire Protection Equipment (AAFP).


The basic standard used to investigate products in this category is UL 155, "Tests for Fire Resistance of Vault and File Room Doors."


The Certification Mark of UL on the product is the only method provided by UL to identify products manufactured under its Certification and Follow-Up Service. The Certification Mark for these products includes the UL symbol, the words "CERTIFIED" and "SAFETY," the geographic identifier(s), and a file number.

Additional Certification Markings

Products covered under this category are additionally marked with the following information:

RATING: CLASS 350 ____ H

Alternate UL Mark

The Classification Mark of UL on the product is the only method provided by UL to identify products manufactured under its Classification and Follow-Up Service. The Classification Mark for these products includes the UL symbol, the word "CLASSIFIED" above the UL symbol (as illustrated in the Introduction of this Directory), and the following additional information:


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UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. UL shall not incur any obligation or liability for any loss, expense or damages, including incidental or consequential damages, arising out of or in connection with the use, interpretation of, or reliance upon this Guide Information.

Last Updated on 2013-05-16
RZNR.GuideInfo RZNR ACTIVE 20130516 19960830

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