Any listing in this product directory or other related materials, where “NRTL” appears next to the product name was tested and is listed by ARL as an NRTL, consistent with the requirements of the NRTL Directive.  Other products are listed solely by ARL under its accreditation to ISO 17025 and ISO 17026.


The products listed are ceiling dampers and/or damper box assemblies intended for installation in hourly rated fire resistive floor-ceiling and roof-ceiling constructions.  Ceiling dampers are investigated in accordance with the Standard for Ceiling Dampers, ANSI/UL 555C.  Fire resistive assemblies are investigated in accordance with the Standard for Fire Tests of Building Construction and Materials, ANSI/UL 263.

Ceiling dampers are intended for use in air-handling duct outlets which penetrate membrane ceilings of hourly-rated fire resistive assemblies, or for installation in the ceiling membrane of such assemblies which utilize the plenum space for return air.  They are designed for use as alternatives to previously tested hinged-door sheet metal type dampers installed at the bottom of sheet metal air ducts over each duct outlet.  Ceiling dampers intended for installation in other types of fire resistive assemblies have been investigated in accordance with the Standard for Fire Tests of Building Construction and Materials, ANSI/UL 263.

The investigation of ceiling dampers involves a comparison of the fire resistance performance of a manufactured ceiling damper with that of a hinged-door sheet metal damper, installed in identical suspended ceiling constructions, to determine that the substitution of the ceiling damper does not reduce the hourly fire resistance rating of the assembly previously rated with the hinged-door type damper.  Ceiling dampers are not assigned hourly ratings.  Dampers are assembly components designated for use in specific hourly rated fire resistive assemblies incorporating air duct outlets penetrating protective membrane ceilings.  The fire resistance performance of the maximum size ceiling damper submitted for test is compared with the performance of the hinged-door type damper protecting the smallest size duct outlet specified in a rated assembly and having the maximum hourly rating for which fire resistance of a specified duration is required.

Tests conducted in accordance with these requirements are intended to demonstrate the performance of ceiling dampers during the period of fire test exposure, and are not intended to determine acceptability for use after exposure to fire.

It is the intent that tests conducted in accordance with the test methods described in the standard develop data to enable regulatory authorities to determine the acceptability of ceiling dampers for use in floor-ceiling and roof-ceiling assemblies of the specified or shorter duration.

Each product is marked with the (manufacturer)'s or private labeler's name, trademark, or identifying symbol, a distinctive type, style, model or catalog designation, the fire resistance design number or type and maximum hourly rating of the fire resistance assembly for which the damper has been investigated, reference to installation in accordance with the (manufacturer)'s installation instructions, and the date of manufacture, which is capable of being in code.  When a (manufacturer) produces dampers at more than one factory, each damper has a distinctive marking to identify it as the product of a particular factory.

These products comply with ARL requirements which include pertinent sections of the Standard for Safety, ANSI/UL 555C, Ceiling Dampers, and are intended for installation in accordance with the Standard for the Installation of Air Conditioning and Ventilating Systems, NFPA 90A; and the Standard for the Installation of Warm Air Heating and Air Conditioning Systems, NFPA 90B.

A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements of the standard, and that involve a risk of fire, electric shock, or injury to persons, have been evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptable level of safety as originally anticipated by the intent of the standard.  A product whose features, characteristics, components, materials, or systems conflict with specific provisions of the standard have been judged to be in non-compliance with the standard.

Only products which properly bear the ARL Listing Mark (Label) are considered Listed by ARL.


Delisted products appear with a double strike through and “DELISTED” after the report number.
Deleted/revised models for listed products appear with a single strike through.



Listed Product Directory (revised 01.13.15)