scope:

These requirements cover smoke dampers intended for use in heating, ventilating, and air conditioning (HVAC) systems. Smoke dampers are intended:

a) To restrict the spread of smoke in HVAC systems that are designed

to be automatically shut down in the event of a fire, or

b) To assist with the control of pressure differentials across

smoke barriers when the HVAC system is part of an engineered smoke

control system.

1.1 revised January 11, 2002

Dampers covered by these requirements are evaluated for use as either:

a) Smoke Dampers - For use in HVAC systems where ducts pass

through smoke barriers.

b) Combination Fire and Smoke Dampers - For locations in HVAC systems where a fire damper and a smoke damper are required at a

single location.

1.2 revised January 11, 2002

Smoke dampers are used for the protection of openings in smoke barriers

or in engineered smoke control systems in accordance with the Standard for Installation of Air Conditioning and Ventilating Systems, NFPA 90A. These damper assemblies are intended for installation in accordance with codes such as the BOCA National Mechanical Code, the SBCCI Standard Mechanical Code, the ICBO Uniform Mechanical Code, and the International

Mechanical Code.

1.3 revised January 11, 2002

1.4 Deleted January 11, 2002

1.5 Deleted January 11, 2002

Combination fire and smoke dampers shall also comply with the applicable

requirements in the Standard for Fire Dampers, UL 555.

A product that contains features, characteristics, components,

materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.

1.7 revised October 27, 2000