Smoke dampers are passive fire protection products used in air conditioning and ventilation air ducts or installed in physical smoke barriers (eg walls). This can be done to prevent the spread of smoke from the fire-origin rooms to other spaces in the same building. The combination of fans and silencers can remove smoke from an area while pressing smoke-free areas around the affected area (inhibiting smoke infiltration to additional areas). can also be used to maintain the required concentration of a cleaner fire suppression agent in space, such as those installed in the supply air channel to restrict the entry of air into space, and as installed on back air channels or dispose to limit the thinning of the net agent from outer space. Smoke dampers are usually installed by sheet metal contractors.
Smoke dampers can be activated by a fire alarm system, usually initiated by a smoke detector, or interlock with a fire suppression system. A smoke damper is close to an electric or pneumatic actuator, or a spring actuator, and can be reset manually or actuated openly on a reset signal to an electric or pneumatic actuator.
Combination fire/smoke dampers are also available if a smoke barrier is desired in the same location as a fire barrier.
According to Underwriter's Laboratory, "UL-certified smoke reducers carry leakage grade ratings indicating the level of air leakage measured by the damper under test conditions."
Fire dampers and smoke dampers are an integral and important part of the building's passive fire protection system.
Video Smoke dampers
Inspection and maintenance
As with other elements of a passive fire protection building system, smoke dampers need to be maintained, checked and repaired to ensure they are functioning properly. The National Fire Protection Association (NFPA) requires the testing, maintenance and repair of smoke dampers as mandated in the Life Safety Code. NFPA 105 states that each silencer should be tested and checked one year after installation. The frequency of testing and examination should be every 4 years, except in the hospital, where the frequency should be every 6 years. This code also states that the damper must be moved and recycled. Inspection should be a document showing the location of the damper, inspection date, inspector name, and deficiencies found.
As well as fire suppression inspections, smoke dampening inspections are required by Authorities Having Jurisdiction (AHJ's). The Council of the International Code, the Joint Commission, the NFPA, and the Marshals Affairs require this inspection as part of the Building Safety Plan.
Maps Smoke dampers
Repair
NFPA 105 requires that "if the damper is not operable, repairs should start as soon as possible".
Fixed smoke dampers are more complicated than fire suppressors due to actuator replacements.
References
External links
- Guarantee Laboratory Information about Dust Smoke
Source of the article : Wikipedia
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