FSD Fire & Smoke Damper Installation & Maintenance 3 — Questions and Answers
Question 1: What does the UL 555 listing standard apply to?
- Smoke dampers
- Fire dampers (Correct answer)
- Ceiling radiation dampers
- Combination fire/smoke dampers
Correct answer: Fire dampers
UL 555 is the standard for Safety Fire Dampers, covering their design, construction, and testing requirements.
Question 2: A ceiling radiation damper is used in which specific application?
- At penetrations of rated floor-ceiling assemblies where ducts pass through (Correct answer)
- In smoke exhaust systems above suspended ceilings
- At the inlet of air handling units in mechanical rooms
- In kitchen exhaust hoods above cooking equipment
Correct answer: At penetrations of rated floor-ceiling assemblies where ducts pass through
Ceiling radiation dampers are installed at light fixture or diffuser openings in rated floor-ceiling assemblies to prevent heat radiation through the ceiling membrane.
Question 3: How often does NFPA 80 require operational testing of smoke dampers?
- Monthly
- Every 6 months for the first year, then annually (Correct answer)
- Every 4 years
- Only after any fire or smoke event
Correct answer: Every 6 months for the first year, then annually
NFPA 80 requires smoke dampers to be tested every 6 months during the first year of operation, then annually thereafter.
Question 4: What is the correct way to secure a fire damper sleeve into a masonry or concrete wall opening?
- Use only construction adhesive rated for high temperature
- Anchor with steel angles or breakaway clips to allow thermal movement (Correct answer)
- Weld the sleeve directly to embedded rebar
- Pack with mineral wool only, without mechanical fasteners
Correct answer: Anchor with steel angles or breakaway clips to allow thermal movement
Fire damper sleeves in masonry openings are secured with steel angle retainers or breakaway clips that allow expansion while maintaining structural integrity.
Question 5: What information is required on the label of a listed fire damper?
- Only the manufacturer name and model number
- UL listing mark, fire rating, airflow direction, and maximum duct velocity (Correct answer)
- Installation torque specifications and paint compatibility
- Acoustic rating and thermal insulation value
Correct answer: UL listing mark, fire rating, airflow direction, and maximum duct velocity
Listed fire dampers must be labeled with the UL mark, fire resistance rating, airflow direction arrow, and the maximum allowable duct velocity.
Question 6: In a multi-zone smoke control system, smoke dampers are typically operated by signals from which system?
- The HVAC thermostat control panel
- The fire alarm control panel (FACP) (Correct answer)
- The energy management system (EMS)
- The building security access control system
Correct answer: The fire alarm control panel (FACP)
Smoke dampers in smoke control systems receive open/close commands from the fire alarm control panel based on detector activation and zone logic.
Question 7: What is the primary difference between a Type B and Type C fire damper classification?
- Type B is for vertical ducts; Type C is for horizontal ducts
- Type B has a 1.5-hour rating; Type C has a 3-hour fire rating (Correct answer)
- Type B requires a fusible link; Type C uses an electric actuator
- Type B is duct-mounted; Type C is wall-mounted
Correct answer: Type B has a 1.5-hour rating; Type C has a 3-hour fire rating
Fire dampers are classified as Type B (1.5-hour fire rating) for use in 1-hour rated barriers, and Type C (3-hour rating) for 2-hour and higher rated barriers.
FSD Fire & Smoke Damper Installation & Maintenance 3
What does the UL 555 listing standard apply to?