Which feature must be included when calculating detector placement?

When calculating detector placement in fire alarm systems, considering the presence of normal sources of interference is crucial. Interference can come from various elements in a building, such as air currents from HVAC systems, steam, dust, smoke from cooking, or even the location of furniture and structural elements that could disrupt or obstruct the smoke or heat reaching the detector.

By taking these factors into account, you ensure that detectors are placed in locations where they can function effectively and provide timely alerts. For example, placing a smoke detector near a kitchen may require careful assessment of air flow patterns to avoid false alarms. Similarly, placing a heat detector in an area with potential heat sources could lead to inaccurate readings.

This careful consideration helps maintain the reliability and efficiency of the fire alarm system, thereby enhancing safety and compliance with building codes and standards.