According to the International Mechanical Code, what is the minimum cfm for a duct smoke detector in the supply?

The minimum airflow requirement for a duct smoke detector is specified in the International Mechanical Code to ensure proper functionality in detecting smoke within the ductwork. The correct choice states that 15000 cfm is the standard minimum volume for air handling units where duct smoke detectors are typically employed. This threshold is crucial because it ensures that the detector is sensitive enough to react to smoke particles in larger airflows, thereby providing adequate protection for occupants and property.

Using a lower minimum could risk false negatives, where smoke may not be detected due to insufficient airflow moving through the system, while using a higher minimum is not applicable for standard installations and could lead to unnecessary complexity and cost. Therefore, establishing the standard at 15000 cfm balances effective smoke detection capabilities with practical application in air management systems.