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fire damper
is a damper used for avoid fire transfer from fire zone to another location of this damper depend on the fire plans you should use it at risers outlet , and any penetration in fire rated wall more than one hour
it contains a curtain with fusible link stopper action happens when this fusible link melt according to temperature rise then curtain slid down to shut off the duct
it is normally opene damper
motorized (smoke) fire damper
is a damper which has an actuator to provide action upon control signal from the main fire control panel
you should use it at all the outlet of smoke exhaust or fresh air mock up
it is normally close damper
Fire dampers serves to interrupt migratory airflow,resist the passage of flame and maintain the integrity of firer rated separation.
Both motorized or normal fire damper function is to prevent the passage of flame from one side of a fire rated separation to the other.Both types will be equipped with a fusible link which holds the blade open until it the link melts.Motorized fire dampers will be functioning with the help of actuators with either an electric or pneumatic actuator. They are controlled by or heat detector signal, fire alarm or some other building control system.
Fire dampers will be available in two basic designs as curtain type and multiple blade type.Multiple blade type will offer greater restriction to airflow than the other type.Fire dampers should be designed and tested under UL standard 555:Standard for the safety for fire dampers.
In general fire dampers will be of normal type only and motorized will be used in the case where there is a situation to control both smoke and fire.
motorized fire damper is like normal damper but fire rated and shape same as normal damper and works with fire command controlled by sensor or BMS to open or close.
The simple fire damper has a fuseable link which works with heat and close the damper like a shutter.
Motorized fire Damper Opening & Closing Function in Fire condition is carried by Motorized Actuator Via Building Management system for Opening& Closing
Normal Fire damper is Provided Fuse link Which Under condition of Fire Defused and damper is closed thus preventing fire to other Areas or Zones
Both motorized and normal fire damper employ same function of light material which has low melting point so that the fire does not spread beyond that area the main difference is that motorized damper can be controlled according to requirement that is either close or open.
where as in case fire damper it has to be manually open once it has been shut off.
