Abstract: A ceiling mountable smoke detector with audible alarm including a close-on-temperature-rise heat sensing switch which controls the activation of a solenoid controlled valve placed over the dispensing opening of a pressurized canister of fire extinguishing powder. The smoke detector and alarm function to sound an alarm upon sensing smoke. When smoke is being sensed simultaneously with sufficiently high heat around the smoke detector, the heat sensing switch closes to allow the activation and opening of the solenoid valve at which point fire retardant is dispersed in the immediate area. The smoke detector, audible alarm, the heat sensing switch, and the solenoid valve and fire retardant canister are built into a single easily installed assembly which may be mounted during new construction prior to the finished ceiling being applied, or may be installed as a "cut-in or remodeler unit" after the ceiling has been applied.