Smoke/fire dampers

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 detection system should sound an audible alarm in the control room and be interlocked to shutdown the air handler in the event smoke is detected. When these areas are not served by an independent HVAC system, an approved 1 -hour fire damper needs to be installed where the duct penetrates the room closure. 

GENERAL CONSIDERATIONS Cooling Towers and Legionnaires Disease Elevator Machine Rooms Energy Conservation Equipment Maintenance Equipment Noise and Vibration Evaporative Cooling Fire and Smoke Control Dampers Outdoor Air Perimeter Heating Process Loads Room Air Motion OCCUPANCIES Clean Rooms Computer Rooms Offices Test Cells... 

Fire dampers in the ventilation systems prevent the spread of smoke and hot gas between fire areas containing safety significant plant within the Nuclear Island, where spread of the fire could otherwise result in KSFs being compromised. 

Fire dampers serving certain safety-significant, smoke-sensitive areas are also closed in response to an initiation signal from the fire detection system. 

Fire dampers and smoke extraction dampers in ventilation ducts with different actuation mechanisms (thermally by fusible link or remote controlled by typically electro-mechanical or pneumatic actuation),... 

Smoke Fire Control (Dampers, Louvers Ducts)... 

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 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. 

Sheet Metal and Air Conditioning Contractors National Association, Inc., (SMACNA), Fire. Smoke and Radiation Damper Installation Guide for HVAC Systems. Fourth Edition, SMACNA, Chantilly, VA, 1993. 

Close HVAC fire and smoke dampers. Close fire doors. 

UL 555S Standard for Leakage Rated Dampers for Use in Smoke Control Systems UL 723 Standard for Test for Surface Burning Characteristics of Building Materials UL 790 Standard for Standard Test Methods for Fire Tests of Roof Coverings (2004)... 

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 ... 

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). 

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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