What is the purpose of a pre-action sprinkler system, and how does it differ from a standard wet-pipe system?
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A
Pre-action systems use dry chemical agents; wet-pipe systems use water
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B
Pre-action systems require two triggers (detector + sprinkler head heat) before water flows; wet-pipe systems release water immediately when a head opens
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C
Pre-action systems operate automatically; wet-pipe systems require manual activation
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D
Pre-action systems are only used in parking garages; wet-pipe systems are used everywhere else