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The correct choice regarding the maximum distance a heat detector can be from any point on a smooth ceiling is based on industry standards and installation guidelines, which are designed to ensure effective detection of heat in a given space. The listed spacing for heat detectors is based on manufacturer recommendations and fire safety codes, which account for optimal performance in detecting heat effectively.
Choosing 0.7 times the listed spacing strikes a balance between adequate coverage and minimizing the risk of heat not being detected. If the distance exceeds this threshold, it may lead to blind spots where heat could go undetected, thus undermining the purpose of the detector—safeguarding against fire hazards effectively. Maintaining this distance ensures that the heat detector operates within its intended parameters, providing a reliable response to temperature changes that signal potential fire.
The alternative options imply either a tighter restriction or a looser allowance, which may compromise the effectiveness of the heat detection system. For instance, being limited to a closer range than 0.7 times could result in unnecessary installations or higher costs without added benefits, while a further distance could lead to insufficient coverage and a higher chance of missed detection. Therefore, 0.7 times the listed spacing is widely acknowledged as the ideal maximum distance for installation on smooth ceilings.