Abstract: A range hood positioned above a cooking range employs a continuous heat sensor system which includes twisted wires which are separated from one another by an insulator which is formed of a material which melts at a predetermined temperature. The wires carry a supervisory current which also flows through an actuator, which may be an electrified system for cutting a tension wire. An indicator lamp, such as an LED, which may have a series resistor associated therewith, limits the current through the actuator to a level below the activation threshold of the actuator.

Abstract: A range hood positioned above a cooking range employs a continuous heat sensor system which includes twisted wires which are separated from one another by an insulator which is formed of a material which melts at a predetermined temperature. The wires carry a supervisory current which also flows through an actuator, which may be an electrified system for cutting a tension wire. An indicator lamp, such as an LED, which may have a series resistor associated therewith, limits the current through the actuator to a level below the activation threshold of the actuator.

Abstract: An evironment which is protected from fire employs a nozzle arrangement having three discharge apertures for distributing a fire suppression fluid such as HALON. The environment is arranged in a predetermined area or space having an odd shape, such as an L-shape, and is adequately protected with a single nozzle arrangement. The nozzle arrangement is characterized by a chamber for receiving the fire suppression fluid at a rate of flow sufficient to supply the fire suppression fluid to the three apertures in conformance with applicable specifications, such as those established by Underwriters' Laboratories, Inc. The discharge apertures in the nozzle arrangement are in the form of through-holes arranged in the chamber wall. Preferably, the apertures are arranged at 90.degree. increments around the chamber wall, whereby the fire suppression fluid is discharged in diametrically opposed directions, and orthogonal thereto.

Abstract: A check system for a chemical fire extinguisher utilizes a normally-closed check valve to prevent escape of pressurized chemical during periodic maintenance of a pressure monitoring system, such as a pressure gauge. An actuator member which is disposed within the flow channel of the fire extinguisher system is used to apply a force to the check system whereby a normally-closed check valve is urged to its open state. This open state establishes communication between the interior of the pressurized tank and the pressure monitoring system. Removal, or loosening, of a coupler, or union, which secures the pressure monitoring system to the chemical tank, permits the check valve to return to its normally-closed state. Thus, the pressure monitoring system can be removed and serviced periodically without requiring the pressurized tank to be emptied.