Why must all holes around a duct detector be sealed?

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The primary reason for sealing all holes around a duct detector is to prevent the redirection or dilution of smoke. Duct detectors are designed to sense smoke carried by the air flowing through the ductwork of an HVAC system. If there are gaps or unsealed areas around the duct detector, outside air can enter the duct system, potentially diluting or redirecting the smoke before it reaches the detector. This could lead to a delayed response or a failure to activate the alarm when a fire or smoke condition is present.

By ensuring that all holes are properly sealed, the integrity of the detection system is maintained, allowing for accurate and timely smoke detection. This is crucial for effective fire safety measures in buildings that rely on HVAC systems, as it directly impacts the performance of the smoke detection equipment. Other options, while they may have relevance in different contexts, do not address the specific function and necessity of sealing around duct detectors in fire safety systems.

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