Depress the disc on DRS-30 or HS-10 (located inside the duct. This will disconnect power to the actuator and cause the damper to close. Push the reset button (located outside the duct) to reengage power and reopen the damper.
What triggers a smoke damper?
Smoke dampers can be activated by the fire alarm system, usually initiated by smoke detectors, or interlocked with a fire suppression system . ... Fire dampers and smoke dampers are an integral and essential part of a building’s passive fire protection system.
How do fire smoke dampers work?
A fire damper is installed within the duct where the duct intersects the barrier . They operate using a heat sensitive device that, when activated, melts and causes the damper components to close. A smoke damper can also be installed within the duct, and is activated by a signal from a smoke detector within the damper.
How are smoke dampers controlled?
Smoke dampers are operated by either a factory-installed elec- tric or a pneumatic actuator. They are controlled by smoke detectors and/or fire alarms .
Are fire dampers normally open or closed?
During normal operation the pressure under the floor is maintained by modulating the damper mounted in the shaft wall. If a fire occurs and the temperature at the damper reaches 165°F (74°C), then the damper closes . If smoke is present in duct (or space area), then damper closes.
Where are fire and smoke dampers required?
Generally, fire dampers are required where air ducts penetrate walls that are rated for 2-hours or more . They are needed in all air transfer openings (non-ducted) in rated walls, regardless of the rating. And they are required at some, but not all penetrations of rated floor assemblies and shaft enclosures.
Do fire smoke dampers require power?
Smoke dampers are motorized with electric or pneumatic actuators and may be controlled by a smoke or heat detector signal, a fire alarm signal, or by the building control system to accomplish the intent of the design.
When should fire dampers be used?
Fire Dampers are used in air transfer openings, ducts and other places where fire rated structures (e.g. walls, floors or other fire barriers) are penetrated .
How often do fire dampers need to be inspected?
1 requires that each damper be tested and inspected 1 year after installation . NFPA 80(10), Sec. 19.4. 1.1 requires that the test and inspection frequency then be every 4 years, except for hospitals, where the frequency is allowed to be every 6 years.
What is a Type A fire damper?
Type-A Fire Damper: Used when the airflow interruption from the stack of blades in the fire damper frame is not a prime concern or consideration . Type-A dampers are the easiest and fastest type to install and are mostly used in low-pressure part of duct systems (up to 2” w.c.).
Where are smoke dampers located?
Location: Fire dampers are installed in or near the wall or floor, at the point of duct penetration , to retain the integrity and fire rating of a wall or floor whether it is a ducted or open-ple- num return application.
Do smoke dampers have a fusible link?
Smoke dampers and most combination fire/smoke damp- ers do not use fusible links to operate . These dampers use an electric or pneumatic actuator to operate the damper.
Why are fire dampers required?
The fire damper secures the integrity of the existing barrier thus preventing fire penetration before temperatures reach the fire rating level of the barrier itself. Its primary function is to prevent the passage of fire from one side to the other of a fire-rated separation.
How do I know if my damper is open or closed?
Before lighting a fire, you can tell if the damper is open by placing your hand into the fireplace. If you feel a draft coming down the chimney , it is a good indicator that the damper is open. If you don’t feel any cold air coming down the chimney, it means that the damper is closed.
How do I know if my zone damper is open or closed?
The air control plate in a manual damper is turned by a lever on the outside of your duct. If the damper handle is in a horizontal position, the damper plate has been set to open . If the damper handle is set vertically, the damper is closed to block air flow.
Are smoke dampers required in a 1 hour wall?
1. Fire dampers are not required in ducted HVAC systems provided the wall is 1-hour fire resistance rated or less, occupancy is not Group H, and the building is equipped throughout with an automatic sprinkler system.
