HVAC Psychrometric Chart Practice Questions Fire Alarm System Quick Reference

Fire Alarm System Fundamentals

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1. System Types & Applications

System Type Description Typical Applications
Conventional Zones with multiple devices, limited addressability Small buildings, retail spaces
Addressable Each device has unique address, precise location Large buildings, campuses
Wireless Radio communication between devices Historic buildings, temporary installations
Voice Evac Includes voice instructions High-rises, hospitals, schools

2. Device Spacing Requirements

Device Type Max Spacing Max Distance from Wall Special Considerations
Smoke Detectors 30 ft (9.1 m) 12 ft (3.7 m) Reduce spacing in high airflow areas
Heat Detectors 50 ft (15.2 m) 25 ft (7.6 m) Required in kitchens, garages
Manual Pull Stations 200 ft (61 m) travel distance N/A Required at all exits
Audible Devices Per NFPA 72 sound calc N/A Min 15 dB above ambient
⚠ CRITICAL: Smoke detectors must not be placed within 3 ft (0.9 m) of air supply vents.

3. Notification Appliance Requirements

Appliance Type Minimum Sound Level Visual Requirements Mounting Height
Horns 75 dB at 10 ft N/A 90" max (above obstructions)
Strobes N/A 15-110 cd (based on room size) 80-96" (public areas)
Speaker Strobes Voice clarity test required 15-110 cd Per strobe requirements
✓ BEST PRACTICE: Use synchronized strobes in sleeping areas to prevent disorientation.

4. Inspection & Testing Requirements

5. Common Deficiencies

Deficiency Code Reference Correction
Blocked smoke detectors NFPA 72 14.4.3 Maintain 36" clearance
Incorrect strobe placement NFPA 72 18.5.5 Follow candela requirements
Missing documentation NFPA 72 7.7 Maintain records for 3 years
⚠ WARNING: Never disable devices during construction without proper fire watch measures.

Reference Standards: NFPA 72 (National Fire Alarm and Signaling Code), IBC Chapter 9, Local AHJ Requirements