[Fire Doors] Fire Door Louvers, GVZS

See General Information for Fire Doors



This category covers fire door louvers intended for installation in certified swinging fire doors as provided by door manufacturers indicated by the individual certifications in the Fire Door (GSNV) categories.

Fire door louvers consist essentially of steel framing members, adjustable steel blades, operating lever, a fusible link and/or a system for automatically closing/sealing the blades when the link is activated.

The fire door louver is intended to be installed in accordance with the installation instructions packaged with the device. The use of steel sex-bolts or steel sheet metal screws to install the louver in the door is required, dependent upon the type of door and design of the louver. The fasteners are furnished as part of the louver.

The fire door louver may be installed in the certified swinging fire doors by some manufacturers at the door manufacturer's plant or in the field. When the louver is intended to be installed in the field, the cutout in the door is made at the door manufacturer's plant, and the door bears a marking indicating the manufacturer and model designation of the certified fire door louver to be installed in the door.

Authorities Having Jurisdiction should be consulted before installation of louvers in fire doors.


The following product identity appears on the product:

    Fire Door Louver


For additional information, see Fire Doors (GSNV) and Fire-resistance Ratings (BXRH).


The basic standard used to investigate products in this category is ANSI/UL 10B, "Fire Tests of Door Assemblies."

Where indicated in the individual certifications, products have additionally been investigated to ANSI/UL 10C, "Positive Pressure Fire Tests of Door Assemblies."


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 additionally investigated to ANSI/UL 10C may be so noted on the product.

Alternate UL Mark

The Listing Mark of UL on the product is the only method provided by UL to identify products manufactured under its Listing and Follow-Up Service. The Listing Mark for these products includes the UL symbol (as illustrated in the Introduction of this Directory) together with the word "LISTED," a control number, and the product name "Fire Door Louver."

Products additionally investigated to ANSI/UL 10C may be so noted on the UL Listing Mark.

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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.

Louvers, Fire Door
Last Updated on 2014-10-21
GVZS.GuideInfo GVZS Active 20141021 20141021

The appearance of a company's name or product in this database does not in itself assure that products so identified have been manufactured under UL's Follow-Up Service. Only those products bearing the UL Mark should be considered to be Certified and covered under UL's Follow-Up Service. Always look for the Mark on the product.

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