Smoke dampers

Fire and smoke damper. A device used to isolate one area of a building from fire or smoke in another, or one part of a duct run from fire or smoke in another. The device is mechanically or electrically operated in case of fire. 

Smoke damper A damper installed in a ductwork system designed to close in case of fite by means of a fusible link and electrical or magnetic device to stop the spread of smoke. 

Smoke dampers are used to prevent the spread of products of combustion within ventilation systems. They are usually activated by the fire alarm and detection system. Smoke dampers are specified on the leakage class, maximum pressure, maximum velocity, installation mode (horizontal or vertical) and degradation test temperature of the fire. 

Close HVAC fire and smoke dampers. Close fire doors. 

Anti-smoke dampers were added in the ventilation system to prevent the diffusion of sodium aerosol. The dampers in the ventilation system are interlocked with the sodium leak detector and fire detector to shut automatically. 

Zone 2A/Zone 2 fire/smoke damper alarm... 

The TR should provide protection for at least 1 hour against fires, explosions, and smoke ingress. Therefore, it must be provided with an air supply, fire and gas detection devices, and smoke dampers. The TR should be located as far away as possible from likely fires and explosions. It may be possible to place the accommodation module on mounts that will help ensure the structure s integrity if hit by a blast wave. 

The following are general applications for fire or smoke dampers per the National Fire Protection Association Standard NFPA-90A, 1996 edition ... 

Provide smoke dampers and associated detectors at air-handling eqnipment whose supply capacity exceeds 2000 ft /min (944 Us). Provide supply and return smoke detectors and associated dampers for units whose return capacity exceeds 15,000 fP/min (7080 L/s).The dampers shall isolate the equipment (including filters) from the remainder of the system except that the smoke dampers may be omitted (subject to approval by the authority having jurisdiction) when the entire air-handling system is within the space served or when rooftop air handlers serve ducts in large open spaces directly below the air handler. 

Refer to the building codes, local fire marshall rules, insurance underwriter s rules, and NFPA-90A for criteria regarding fire and smoke dampers. 

The exit corridors may not be used as a return air space for another area. Duct penetrations of fire-rated corridor walls must be provided with combination fire/smoke dampers (UBC 713.10 and 713.11). 

Smoke dampers, or combination smoke/fire dampers, must be provided at all penetrations of ducts through a smoke partition. Fire dampers shall not be installed in exhaust ducts. Exhaust ducts shall not penetrate area separation walls (UFC 5104.3.2.3). 

The TR should provide protection for at least 1 hour against fires, explosions, and smoke ingress. Therefore, the TR must be provided with an air supply, fire and gas detection, and smoke dampers. 

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