These fire smoke dampers are designed for use in hvac systems requiring emergency fire smoke control.
Fire damper in hvac duct.
Static duct fire dampers.
They can accommodate airflow in either direction.
They have a fusible link that melts at 165 f releasing a spring and causing the blades to close.
Static fire dampers are used in applications where the fans shut down during fire and smoke control.
Dynamic fire damper styles.
They are undersized to fit inside duct.
However in situations where the hvac fans shut down when smoke is detected or a fire alarm is triggered experts will install a standard damper also known as a static fire damper in your air ducts.
Yes it is and the inspector is correct.
We are installing a new hvac system in the basement of the hospital.
According to nfpa 90a 2012 section 5 3 2 1 where air ducts extend through only.
Heavy duty coil spring drives the fire damper curtain closed.
Dynamic duct fire dampers.
Fusible link melts releasing the fire damper curtain.
Static fire dampers can be used in both vertical and horizontal positions.
Fire dampers are ul555 tested and labeled devices installed in ducts and air transfer openings or air distribution systems designed to close upon the detection of heat.
Dampers meet ul 555 fire safety standards to help prevent the spread of fire for 1 hours.
In the event of a fire these dampers automatically stop airflow through duct.