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Heat Activated Fire Alarm Model QR-50 Owner’s Manual Masterguard. The Heat Alarm plays an important role in protecting your family and home from the dangers of fire. Please carefully read and follow the information in this booklet to ensure that your alarm will operate properly and is located in the areas best suited for heat activation. The QR-50 Heat Alarm adds an extra level of fire protection to most household settings. Although the primary form of fire warning is properly located and maintained smoke alarms, complete fire protection can be achieved from a combination of heat and smoke alarms properly installed throughout the home. The QR-50 is for indoor, residential use only.