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.

How does a combination fire smoke damper work?

Fire dampers respond to heat, when the temperature reaches a set point the damper slams shut. Smoke dampers respond to the detection of smoke, and close automatically. They can also be activated remotely. They resist the passage of smoke, toxic gases and air through a fire barrier.

What is the difference between a fire damper and a fire smoke damper?

Whilst fire dampers function to help stop the passage of fire, smoke dampers work in a similar way to preserve the integrity of physical smoke barriers e.g. floors and walls. They can also be found within air conditioning and ventilation ductwork.

Are fire dampers normally open or closed?

Fire dampers normally close when the temperature of the fusible link reaches 165˚F, although some local variations exist. For example, if steam coils are present in ducts, use of a 212˚F high limit may be used.

Do fire smoke dampers need power?

Motorized actuators are normally used for the operation of smoke dampers. The designer must consider the case where there is loss of normal power to the damper actuator. Either emergency power should be provided or smoke dampers should be arranged for fail-safe closure upon failure of power to the actuator.

Are smoke dampers required in smoke partitions?

Smoke dampers are required at penetrations of smoke barriers, unless the HVAC system is fully ducted and there is a sprinkler system installed throughout the facility, in which case they are not required. Smoke dampers are also required in air transfer openings (non-ducted) in smoke partitions.

What is the minimum temperature rating for a smoke damper?

250 °F
All build- ing codes in the USA require smoke dampers to have a minimum elevated temperature rating of 250 °F (140 °C). Leakage Test: The amount of leakage measured during this test shall determine the leakage class of the damper. For smoke dampers the leakage test is a continuation of the operation test.

Do you need a fire damper in a 30 minute wall?

Fire-resisting ducts are required to have a minimum fire resistance of 30 minutes (integrity).

Do fire smoke dampers require power?

How do you reset a fire smoke damper?

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.