Smoke detectors placed in environmental air handling areas are allowed to substitute for open area protection.

Smoke detectors placed in environmental air handling areas are allowed to substitute for open area protection.

• A. True
• B. False
• C. Only in existing buildings
• D. Only with consent of fire marshal

Answer: (B)

Open area protection means detectors placed to monitor large, unconfined spaces for early smoke detection. Detectors in environmental air handling areas are duct or HVAC-area detectors designed to sense smoke entering the ventilation system and to trigger controls for that system. They are intended to protect the mechanical equipment and help control smoke spread, not to provide full life-safety coverage for open spaces themselves. Because smoke can accumulate in a room or corridor without immediately entering the HVAC ducts, relying solely on duct detectors would leave open areas inadequately covered. Therefore, duct detectors cannot substitute for open area protection.

Open area protection means detectors placed to monitor large, unconfined spaces for early smoke detection. Detectors in environmental air handling areas are duct or HVAC-area detectors designed to sense smoke entering the ventilation system and to trigger controls for that system. They are intended to protect the mechanical equipment and help control smoke spread, not to provide full life-safety coverage for open spaces themselves. Because smoke can accumulate in a room or corridor without immediately entering the HVAC ducts, relying solely on duct detectors would leave open areas inadequately covered. Therefore, duct detectors cannot substitute for open area protection.