UL PRODUCT CATEGORY

Dampers for Fire Barrier and Smoke Applications, EMME


Guide Information for Fire Resistance Ratings

Guide Information for Heating, Cooling, Ventilating and Cooking Equipment

702.1704.14705.11706.10707.11707.7708.9709.8710.8711.7712.4.4716716.2716.2.2716.3716.3.1716.3.2716.5716.5.1716.5.2716.5.3716.5.4716.5.4.1716.5.5716.6.1716.6.3909909.10909.10.4909.18.3909.20.4.2909.5.2909.5.2.11020.1.31021.5607.3607.3607.3.1.1607.3.2607.6.3450.45(E)645.4(2)450.45(E)645.4(2)

GENERAL

This category covers fire dampers, smoke dampers (leakage-rated dampers), combination fire and smoke dampers (fire and leakage-rated dampers), and corridor dampers.

Installation — All dampers covered under this category are intended to be installed in accordance with the installation instructions provided with the dampers. Authorities Having Jurisdiction should be consulted before installation. Unless otherwise indicated in the installation instructions, the annular space between the sleeves of fire dampers, combination fire and smoke dampers, or corridor dampers and the wall opening should not be filled with firestop materials such as fill, void or cavity materials.

Air-flow and Pressure Ratings — Fire dampers for use in dynamic systems, smoke dampers, combination fire and smoke dampers, and corridor dampers are marked with the maximum air flow and static pressure HVAC system conditions for which the damper has been investigated. The air-flow (velocity) ratings are established in increments of 1000 CFM/ft2 of damper area (FPM), with the minimum being 2000 CFM/ft2. The air-flow ratings are established based on test conditions with the damper in the full open position. The static pressure ratings are established in increments of 2 in.WG, with the minimum being 4 in.WG. The static pressure ratings are established based on test conditions with the damper in the full closed position.

Sizes — The maximum sizes expressed in inches representing the maximum width and maximum height are shown in the individual certifications for each fire damper model, for both single sections and multiple section assemblies.

Abbreviations — The following abbreviations are used in the individual certifications:

Fire-protection Rating

  • HR Class — Hourly Classification

Damper-mounting Position

  • V — Vertical
  • H — Horizontal
  • V, H — Vertical & Horizontal

Maximum Damper Size

  • W — Width
  • H — Height

FIRE DAMPERS

Fire dampers are intended for installation where air ducts penetrate or terminate at openings in walls or partitions; in air transfer openings in partitions; and where air ducts extend through floors as specified in ANSI/NFPA 90A, "Installation of Air-Conditioning and Ventilating Systems." Fire dampers are prescribed for use by codes such as the "International Building Code" (IBC), "International Mechanical Code" (IMC) and "Uniform Mechanical Code" (UMC).

Fire dampers have been investigated for fire-protection ratings of 1-1/2 or 3 h as indicated in the individual certifications.

Fire Dampers for Use in Dynamic Systems — Fire dampers for use in dynamic systems are intended for use in dynamic HVAC systems that remain operational during a fire, and may also be employed in static systems.

Fire Dampers for Use in Static Systems — Fire dampers for use in static systems are intended for use only in static HVAC systems that are automatically shut down in the event of a fire.

SMOKE DAMPERS

Smoke dampers (leakage-rated dampers) are intended for the protection of openings in smoke barriers, or in engineered smoke-control systems as specified in ANSI/NFPA 90A. Smoke dampers are prescribed for use by codes such as the IBC, IMC and UMC.

Leakage ratings for smoke dampers are identified as Class Designation I, II or III as shown in the following table. Leakage ratings of the dampers are established at a minimum differential pressure of 4 in. water gauge (WG), across the closed damper. Leakage rates may also be established at higher differential pressures, in increments of 2 in. water gauge.

Maximum Leakage
(CFM/ft2)

Class 4 In. WG 6 In. WG 8 In. WG 10 In. WG 12 In. WG
I 8.0 9.5 11.0 12.5 14.0
II 20.0 24.0 28.0 31.5 35.0
III 80.0 96.0 112.0 125.0 140.0

Leakage ratings for smoke dampers are determined at elevated temperatures. The elevated temperatures are in increments of 100°F with the minimum temperature being 250°F. Leakage ratings of smoke dampers are established based on test conditions using heated air.

Certified dampers are marked with respect to the Leakage Class at elevated test temperature.

COMBINATION FIRE AND SMOKE DAMPERS

Combination fire and smoke dampers (fire and leakage-rated dampers) are intended for use in locations that are designated as both fire barriers and smoke barriers. These products can also be described as combination fire/smoke dampers as defined by the IBC. Combination fire and smoke dampers have been investigated for both a fire-protection rating of 1-1/2 or 3 h, and a leakage rating as defined under SMOKE DAMPERS. Leakage ratings of combination fire and smoke dampers are determined at an elevated temperature 250°F or 350°F. Leakage ratings of combination fire and smoke dampers are established based on test conditions using heated air.

CORRIDOR DAMPERS

Corridor dampers are intended for use where air ducts penetrate or terminate at horizontal openings in the ceilings of interior corridors, as defined in the "City of Los Angeles Building Code," IBC, or where permitted by the Authority Having Jurisdiction.

Corridor dampers have been investigated for, and are intended for, installation only in specific corridor ceiling constructions as defined in the installation instructions provided with each damper.

Corridor dampers have been investigated for both a fire-resistance rating of 1 h, and a Class I or II leakage rating as defined under SMOKE DAMPERS. Leakage ratings of corridor dampers are determined at an elevated temperature 250°F or 350°F. Leakage ratings of corridor dampers are established based on test conditions using air. Corridor dampers have also demonstrated acceptable closure performance when subjected to 150 fpm velocity across the face of the damper during fire exposure.

MAINTENANCE

Fire dampers, smoke dampers, combination fire and smoke dampers, and corridor dampers may require periodic maintenance to ensure continued proper operation. The level of maintenance required is dependent on several factors including the product manufacturer's and system designer's recommendations, code requirements, and the complexity of the system in which the damper is installed.

It is recommended that periodic maintenance of dampers include at least the following:

  • Removal of debris buildup from the damper and surrounding area
  • Manual cycling of dampers released by fusible links
  • Cycling of damper and actuator assemblies

Additional information on periodic inspection, testing, and maintenance of fire dampers, combination fire and smoke dampers, and ceiling dampers can be found in ANSI/NFPA 80, "Fire Doors and Other Opening Protectives."

Additional information on periodic inspection, testing, and maintenance of smoke dampers and combination fire and smoke dampers can be found in ANSI/NFPA 105, "Installation of Smoke Door Assemblies and Other Opening Protectives."

Additional information on periodic testing of smoke-control systems can be found in ANSI/NFPA 92, "Smoke Control Systems."

RELATED PRODUCTS

For dampers intended for installation in air-handling openings penetrating fire-resistive membrane ceilings, see Ceiling Dampers (CABS).

ADDITIONAL INFORMATION

For additional information, see Heating, Cooling, Ventilating and Cooking Equipment (AAHC) and Fire Resistance Ratings (BXRH).

REQUIREMENTS

The basic standard used to investigate fire dampers for use in dynamic systems and fire dampers for use in static systems in this category is ANSI/UL 555, "Fire Dampers."

The basic standard used to investigate smoke dampers in this category is ANSI/UL 555S, "Smoke Dampers."

Combination fire and smoke dampers, and corridor dampers are investigated to the applicable requirements of both ANSI/UL 555 and ANSI/UL 555S.

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:

FIRE DAMPER
FOR USE IN DYNAMIC SYSTEMS
+ HR

or

FIRE DAMPER
FOR USE IN STATIC SYSTEMS
+ HR

or

SMOKE DAMPER
FOR LEAKAGE RESISTANCE CLASS ++-+++

or

COMBINATION FIRE AND SMOKE DAMPER
FOR + HR
LEAKAGE RESISTANCE CLASS ++-+++

or

CORRIDOR DAMPER
FOR + HR
LEAKAGE RESISTANCE CLASS ++-+++
+ 1, 1-1/2 or 3


++ I, II or III


+++ Elevated test temperature, °F

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:

FIRE DAMPER
FOR USE IN DYNAMIC SYSTEMS
+ HR
No.

or

FIRE DAMPER
FOR USE IN STATIC SYSTEMS
+ HR
No.

or

SMOKE DAMPER
LEAKAGE RESISTANCE CLASS ++ - +++
No.

or

COMBINATION FIRE AND SMOKE DAMPER
+ HR
LEAKAGE RESISTANCE CLASS ++ - +++
No.

or

CORRIDOR DAMPER
+ HR
LEAKAGE RESISTANCE CLASS ++ - +++
No.

+ 1, 1-1/2 or 3

++ I, II or III

+++ Elevated test temperature, °F

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Combination Fire and Smoke DampersCorridor DampersFire Dampers for Use in Dynamic SystemsFire Dampers for Use in Static SystemsSmoke Dampers
Last Updated on 2013-05-16
EMME.GuideInfo EMME Active 20130516 20120210

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