F80 Fire Safety Systems 3 — Questions and Answers
Question 1: What is the primary purpose of a fire damper installed in an HVAC duct?
- Increase airflow efficiency
- Prevent fire and smoke from spreading through ductwork (Correct answer)
- Reduce noise in the duct system
- Filter particulates from recirculated air
Correct answer: Prevent fire and smoke from spreading through ductwork
Fire dampers close automatically when a fusible link melts, blocking the passage of fire and smoke through HVAC ductwork.
Question 2: Under NFPA 25, how often must wet pipe sprinkler systems undergo a full flow test of the main drain?
- Monthly
- Quarterly
- Annually (Correct answer)
- Every 5 years
Correct answer: Annually
NFPA 25 requires an annual main drain test to verify that water supply pressure and flow are adequate.
Question 3: Which type of heat detector operates by responding to the rate at which temperature rises rather than a fixed temperature threshold?
- Fixed-temperature detector
- Rate-of-rise detector (Correct answer)
- Photoelectric detector
- Ionization detector
Correct answer: Rate-of-rise detector
Rate-of-rise heat detectors trigger an alarm when temperature increases more than a set number of degrees (typically 12–15°F) per minute.
Question 4: A Class K fire extinguisher is specifically designed for use on which type of fire?
- Electrical equipment fires
- Flammable metal fires
- Cooking oils and fats in commercial kitchens (Correct answer)
- Ordinary combustibles like wood and paper
Correct answer: Cooking oils and fats in commercial kitchens
Class K extinguishers use wet chemical agents that saponify cooking oils and fats, making them the required choice for commercial kitchen hood systems.
Question 5: What does a 'listed' fire protection product mean in terms of code compliance?
- It has been approved by the local authority having jurisdiction only
- It appears on a manufacturer's published catalog
- It has been evaluated and found acceptable by a nationally recognized testing laboratory (Correct answer)
- It meets the minimum price threshold for commercial use
Correct answer: It has been evaluated and found acceptable by a nationally recognized testing laboratory
A listed product has been tested by an organization such as UL or FM Global and found to meet specific performance standards for its intended use.
Question 6: In a dry pipe sprinkler system, what fills the piping between the dry pipe valve and the sprinkler heads?
- Water at low pressure
- Pressurized air or nitrogen (Correct answer)
- Halon gas
- Foam concentrate
Correct answer: Pressurized air or nitrogen
Dry pipe systems keep the distribution piping filled with pressurized air or nitrogen so that water is not present in areas subject to freezing.
Question 7: Which NFPA standard governs the installation of fire alarm systems in the United States?
- NFPA 13
- NFPA 25
- NFPA 72 (Correct answer)
- NFPA 101
Correct answer: NFPA 72
NFPA 72, the National Fire Alarm and Signaling Code, sets requirements for the installation, maintenance, and testing of fire alarm systems.
F80 Fire Safety Systems 3
What is the primary purpose of a fire damper installed in an HVAC duct?