Smoke dampers shall comply with UL 555S, and shall be installed in accordance with the manufacturer's
installation instructions where required by the building code.
Fire dampers shall comply with UL
555, and shall be installed in accordance with the manufacturer's
installation instructions where required by the building
code. Fire dampers shall have been tested for closure under
airflow conditions and shall be labeled for both maximum
airflow permitted and direction of flow. Where more than one damper is installed at a point in a single air path, the entire
airflow shall be assumed to be passing through the smallest damper area.
Ductwork shall be connected to damper sleeves or assemblies in accordance with the fire damper manufacturer's installation instructions.
Ductwork shall be connected to damper sleeves or assemblies in accordance with the fire damper manufacturer's installation instructions.
Ceiling radiation dampers shall comply with UL 555C, and shall be installed in
accordance with the manufacturer's installation instructions
in the fire-resistive ceiling element of floor-ceiling and roof-ceiling
assemblies where required by the building code. Fire
dampers not meeting the temperature limitation of ceiling radiation dampers shall not be used as a substitute.
Where size requires the use of
multiple dampers, the installation shall be framed in an approved manner to ensure that the dampers remain in place.
Fire and smoke dampers
shall be provided with an approved means of access large
enough to allow inspection and maintenance of the damper
and its operating parts. The access shall not affect the integrity
of the fire resistance-rated assembly. The access openings
shall not reduce the fire resistance rating of the assembly.
Access shall not require the use of tools. Access doors in ducts shall be tight fitting and approved for the required duct construction. Access points shall be permanently identified on the exterior by a label with letters not less than 1/2 of an inch (12.7 mm) in height reading as one of the following:
Access shall not require the use of tools. Access doors in ducts shall be tight fitting and approved for the required duct construction. Access points shall be permanently identified on the exterior by a label with letters not less than 1/2 of an inch (12.7 mm) in height reading as one of the following:
- Smoke Damper
- Fire Damper
- Fire/Smoke Damper
Dampers shall be
installed in a manner to ensure positive closing or opening as
required by function. Interior liners or insulation shall be held
back from portions of a damper, its sleeve, or adjoining duct
that would interfere with the damper's proper operation. Exterior
materials shall be installed so as to not interfere with the
operation or maintenance of external operating devices
needed for the function of the damper.
Fusible links, thermal sensors, and pneumatic or electric operators
shall have a temperature rating or classification as in
accordance with the building code.
When the automatic activation of a smoke damper or a
combination smoke-fire damper occurs, the HVAC system
serving such dampers shall immediately shut down.
Exceptions:
Exceptions:
- HVAC systems that are part of an engineered smoke evacuation system.
- Where the automatic activation causes all the smoke dampers and combination smoke-fire dampers to close in the enclosed space having a common atmosphere where openings are required to be protected.
- Where analysis demonstrates shutoff would create a greater hazard.