Wet chemical systems are designed to provide fire protection for commercial kitchen hoods. They provide efficient, automatic detector response with fast-acting fire suppression with no danger of re-flash or re-ignition. The installation comprises gas cylinders, steel piping, discharge nozzles, control head, detector with fusible element and manual pull station. The system provides automatic actuation and can be manually actuated through a manual pull station. Upon actuation, the system discharges a pre-determined amount of agent to the duct, plenum, and cooking appliances.

A typical wet chemical system installation is shown as below.