Which factor would most likely cause a reduction in smoke detector spacing?

Which factor would most likely cause a reduction in smoke detector spacing?

• A. Ceiling color
• B. Air changes per hour
• C. Number of detectors
• D. Occupant density

Answer: (B)

Air movement controls how quickly smoke moves and builds up in a space. When a space has a high air changes per hour, the air is constantly circulating, which carries smoke away from its source and dilutes its concentration. In that situation, a detector placed at a given distance is less likely to encounter enough smoke to trigger promptly, so you’d tighten spacing to ensure smoke plumes intersect a detector sooner. That’s why higher air changes per hour would lead to reducing the detector spacing. Ceiling color, the total number of detectors, and occupant density can influence other design or nuisance factors, but they don’t dictate closer detector spacing in the same way elevated ventilation does.

Air movement controls how quickly smoke moves and builds up in a space. When a space has a high air changes per hour, the air is constantly circulating, which carries smoke away from its source and dilutes its concentration. In that situation, a detector placed at a given distance is less likely to encounter enough smoke to trigger promptly, so you’d tighten spacing to ensure smoke plumes intersect a detector sooner. That’s why higher air changes per hour would lead to reducing the detector spacing. Ceiling color, the total number of detectors, and occupant density can influence other design or nuisance factors, but they don’t dictate closer detector spacing in the same way elevated ventilation does.