Some of the more significant revisions in the 2007 edition addressed protection of fire alarm control units, personnel
qualification, heat detector response time, smoke detector spacing, smoke detection in ducts, detectors that use
multiple sensing inputs, video image smoke and flame detection, synchronization of visible notification appliances,
exit marking audible notification appliances, tactile notification appliances, different types of protected premises fire
alarm system, and in-building enhancement systems for firefighter radio communications.