UL PRODUCT CATEGORY

Ceiling Dampers, CABS


Guide Information for Fire-resistance Ratings

702.1712.4.4716716.2716.3716.5716.6.1716.6.2716.6.2.1607.3607.6.2607.6.2.1450.45(E)450.45(E)

USE AND INSTALLATION

This category covers ceiling dampers investigated for use in fire-resistance designs as detailed in Fire-resistance Ratings - ANSI/UL 263 (BXUV).

Ceiling dampers are designed to function as a heat barrier in air-handling openings penetrating the ceiling membrane of fire-resistive floor-ceiling designs and/or roof-ceiling designs for which they have been investigated.

The certifications for ceiling dampers are published in two different methods:

1. Some ceiling dampers are intended for use in lieu of hinged-door-type dampers in floor-ceiling and/or roof-ceiling designs that contain air ducts and specify the use of a hinged-door-type damper over each duct outlet. Under this method of certification, a certified ceiling damper may be substituted for the hinged-door-type damper specified in the design in accordance with the provisions of the certification of the ceiling damper. An air duct with a hinged-door-type damper must be a specified component of the floor-ceiling and/or roof-ceiling design for this certification method to apply. For ceiling dampers of this type, the individual certifications specify (1) the model number of the damper, (2) the type of assembly (floor-ceiling and/or roof-ceiling) in which the damper may be used, (3) the hourly rating of the assembly in which the damper may be used, and (4) the conditions under which the ceiling damper may be substituted for the hinged-door-type damper (e.g., one ceiling damper for each 113 sq in. or larger duct outlet protected with a hinged-door-type damper).
2. Some ceiling dampers are intended for use in specific floor-ceiling and/or roof-ceiling designs as specified in the designs and marked on the damper. Under this method of certification, the certified ceiling damper must be directly referenced in the floor-ceiling and/or roof-ceiling design, by manufacturer and model number, in order to be utilized in that design. Only the dampers specified in the design may be utilized. For ceiling dampers intended for use in specific designs, the individual certifications specify (1) the model number of the damper, (2) the size of the ceiling damper, and (3) the specific design(s) in which the damper may be utilized. Where the design indicates the damper is optional, the intent is the inclusion of the duct outlet is optional. If a duct outlet is provided, it must be protected with the specified ceiling damper.

Ceiling dampers are intended to be installed in accordance with the provided installation instructions. For ceiling dampers intended for installation in a duct outlet in lieu of hinged-door-type dampers, the location of the ceiling damper in the duct outlet relative to the ceiling level is specified in the installation instructions. This location must be followed during installation in order to obtain the hourly fire-rated performance of the design.

PRODUCT MARKINGS

A separate label located adjacent to the Certification Mark identifies whether the ceiling damper has been investigated for use in static or dynamic systems. The label for ceiling dampers for use in dynamic systems also includes the maximum air flow and closure pressure for which the damper has been investigated. A ceiling damper labeled for use in dynamic systems is also suitable for use in static systems.

PRODUCT IDENTITY

The following product identity appears on the product:

    Ceiling Damper

RELATED PRODUCTS

For information on related products, see Fire-resistance Ratings - ANSI/UL 263 (BXUV).

ADDITIONAL INFORMATION

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

REQUIREMENTS

The basic standard used to investigate the physical performance of ceiling dampers in this category is ANSI/UL 555C, "Ceiling Dampers."

The basic standard used to investigate the fire-resistance performance of ceiling dampers in this category for use in floor-ceiling and/or roof-ceiling designs in lieu of the hinged-door-type dampers shown in those designs is ANSI/UL 555C.

The basic standard used to investigate the fire-resistance performance of ceiling dampers in this category for use in floor-ceiling and/or roof-ceiling designs that do not indicate the use of hinged-door-type dampers in the design is ANSI/UL 263, "Fire Tests of Building Construction and Materials."

Fire performance measured by ANSI/UL 263 is based upon the assumption that air movement will be effectively stopped at the start of a fire. Ceiling dampers intended for use in HVAC systems where the airflow is operational at the time of a fire, such as in a smoke-control system, or from other situations in which the fan system is operational at the time of a fire, are investigated for dynamic closure. Ceiling dampers intended for use where the air movement is effectively stopped at the start of a fire are not required to be investigated for dynamic closure.

UL MARK

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:

AS TO FIRE RESISTANCE
DESIGN NO(S). ____
SEE UL ONLINE CERTIFICATIONS DIRECTORY

or

AS TO FIRE RESISTANCE
SEE UL ONLINE CERTIFICATIONS DIRECTORY

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:

CEILING DAMPER
FIRE RESISTANCE CLASSIFICATION
DESIGN NO(S). ____
SEE UL FIRE RESISTANCE DIRECTORY
No.

or

CEILING DAMPER
FIRE RESISTANCE CLASSIFICATION
SEE UL FIRE RESISTANCE DIRECTORY
No.

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Dampers, Ceiling
Last Updated on 2014-03-03
CABS.GuideInfo CABS Active 20140303 20140304

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