CFAA Fire Alarm Technician · Question
Which device is typically used to trigger a fan shutdown during a fire?
If a fire alarm system is integrated with the HVAC to shut down fans, this shutdown must occur within the required time limits for smoke detection.
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Question: Which device is typically used to trigger a fan shutdown during a fire?
Answer options:
- A handheld remote
- A smoke detector in the supply/return air duct ✅ A latching relay triggered by the fire alarm system
- A manual pull station located in the elevator cab
Correct answer: A latching relay triggered by the fire alarm system
Explanation: If a fire alarm system is integrated with the HVAC to shut down fans, this shutdown must occur within the required time limits for smoke detection.
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Question explanations
- The primary power for a fire alarm system must be:
- If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the cu
- In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, wha
- A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
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