The C4403A1R class A1R rate-of-rise heat detector generates an alarm condition when it detects a sudden rise in temperature or if it detects a static temperature of between 54ºC and 65ºC. Heat detectors are typically used in environments where smoke detectors cannot be installed, for example, in areas susceptible to fumes, airborne materials and smoke such as in kitchens, loading bays, workshops, wood mills and nightclubs.