What is the detection device most often found in a hood and duct dry chemical system?

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In hood and duct dry chemical systems, the release mechanism is a heat-activated fusible link. This small metal link is designed to melt when the surrounding temperature reaches a preset level typical of cooking heat. Once the link melts, it releases the discharge mechanism, allowing the dry chemical powder to flow into the hood and duct to suppress the fire quickly.

Smoke detectors and flame detectors are sensors that alert you to a fire but don’t directly actuate the dry chemical discharge in this type of system. A glass bulb is another type of heat-activated device used in some other systems, but it’s not the standard release method for hood and duct dry chemical systems.