When installing smoke detectors in rooms with HVAC diffusers, how far away are the detectors required to be from the venting?

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Multiple Choice

When installing smoke detectors in rooms with HVAC diffusers, how far away are the detectors required to be from the venting?

Explanation:
The key idea is to prevent air movements from HVAC diffusers from skewing the smoke-sensing air. If a detector sits too close to a vent, the direct airflow can sweep smoke away from the sensor or cause drafts that trigger false alarms or delay true detection. Keeping the detector at least three feet from any vent ensures the air reaching the sensor is part of the room’s mixed air, not dominated by a strong draft from the diffuser. This spacing helps the detector respond reliably to a real fire rather than reacting to ventilation air.

The key idea is to prevent air movements from HVAC diffusers from skewing the smoke-sensing air. If a detector sits too close to a vent, the direct airflow can sweep smoke away from the sensor or cause drafts that trigger false alarms or delay true detection. Keeping the detector at least three feet from any vent ensures the air reaching the sensor is part of the room’s mixed air, not dominated by a strong draft from the diffuser. This spacing helps the detector respond reliably to a real fire rather than reacting to ventilation air.

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