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Extended Coverage sprinklers such as the Model LT56 series are quick-response sprinklers for use in Light Hazard occupancies only. Model LT56 and Model LT56-300 sprinklers have a glass bulb operating element. They are cULus Listed Specific Application sprinklers designed for installation in accordance with NFPA 13. The spray pattern is specifically designed to cover long narrow spaces, such as corridors and hallways.