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“The most common configuration uses an electro-magnet to hold the door open. Power to the electro-magnet is disconnected upon activation of a fire alarm system, smoke alarm system or by some other means, thereby deactivation the electro-magnet. Other combination hold-open and closer devices are available that contain integral smoke or heat detectors that initiate release of the door upon activation. Rather than an electro-magnet hold open, electro-mechanical closers are also available. Any of these hold-open devices also allow the door to be closed manually if so desired. The code does not stipulate the method for activation of the automatic-closing device. For residential buildings regulated by the IRC, activation in most cases will be accomplished by detection of smoke, either through a nearby smoke alarm or an integral smoke detection device.”