A dry ceiling-only storage occupancy fire protection system comprising: a grid of control mode sprinklers defining a sprinkler-to-sprinkler spacing ranging from 2.4m to 3.6m (eight feet to twelve feet (8ft. - 12 ft.)) suitable for defining a coverage area per sprinkler ranging from about 7.43m 2 (eighty square feet (80 sq. ft.)) to about 9.29m 2 (one hundred square feet (100 sq. ft.)), each sprinkler including a sprinkler body having an inlet and an outlet with a passageway disposed therebetween defining a nominal K-factor of at least one of approximately 17, 19, 22, 25 and 28 - 36, a closure assembly, a thermally rated trigger assembly to support the closure assembly adjacent the outlet of the sprinkler body, the trigger assembly having a temperature rating of about 141.1°C (286 °F), and a deflector spaced adjacent the outlet to define an upright configuration of the sprinkler; and a network of pipes including at least one main pipe and a plurality of spaced apart branch lines interconnecting the grid of control mode sprinklers, the network of pipes locating the grid of sprinklers relative to a fluid source in which about fourteen to twenty-six (14 - 26) hydraulically remote sprinklers in the grid of control mode sprinklers define a hydraulic design area of the system, the network of pipes delivering, in use, upon activation of a first hydraulically remote sprinkler a minimum operating pressure ranging from about 103.42 to 310.26 kPa (fifteen to about forty-five pounds per square inch (15 psi. to 45 psi.)) of fluid from the fluid source to each of the hydraulically remote sprinklers within the range of twenty-five and thirty seconds (25-30 sec.), the system suitable for protecting either a commodity of at least Class I and Class II stored beneath a ceiling having a maximum ceiling height from 9.14m to 13.72m (thirty feet to forty five feet (30 ft. - 45 ft.)), the commodity having a storage configuration of any one of rack, palletized, bin box, and shelf storage, the rack storage being any one of single-row, double-row and multi-row rack storage; or, a commodity of Class III stored beneath a ceiling having a ceiling height ranging from 9.14m to 13.72m (thirty feet to forty five feet (30 ft. - 45 ft.)), the commodity having a storage configuration of any one of rack, palletized, bin box, and shelf storage, the rack storage being any one of single-row, double-row and multi-row rack storage. a grid of control mode sprinklers defining a sprinkler-to-sprinkler spacing ranging from 2.4m to 3.6m (eight feet to twelve feet (8ft. - 12 ft.)) suitable for defining a coverage area per sprinkler ranging from about 7.43m 2 (eighty square feet (80 sq. ft.)) to about 9.29m 2 (one hundred square feet (100 sq. ft.)), each sprinkler including a sprinkler body having an inlet and an outlet with a passageway disposed therebetween defining a nominal K-factor of at least one of approximately 17, 19, 22, 25 and 28 - 36, a closure assembly, a thermally rated trigger assembly to support the closure assembly adjacent the outlet of the sprinkler body, the trigger assembly having a temperature rating of about 141.1°C (286 °F), and a deflector spaced adjacent the outlet to define an upright configuration of the sprinkler; and a network of pipes including at least one main pipe and a plurality of spaced apart branch lines interconnecting the grid of control mode sprinklers, the network of pipes locating the grid of sprinklers relative to a fluid source in which about fourteen to twenty-six (14 - 26) hydraulically remote sprinklers in the grid of control mode sprinklers define a hydraulic design area of the system, the network of pipes delivering, in use, upon activation of a first hydraulically remote sprinkler a minimum operating pressure ranging from about 103.42 to 310.26 kPa (fifteen to about forty-five pounds per square inch (15 psi. to 45 psi.)) of fluid from the fluid source to each of the hydraulically remote sprinklers within the range of twenty-five and thirty seconds (25-30 sec.), the system suitable for protecting either a commodity of at least Class I and Class II stored beneath a ceiling having a maximum ceiling height from 9.14m to 13.72m (thirty feet to forty five feet (30 ft. - 45 ft.)), the commodity having a storage configuration of any one of rack, palletized, bin box, and shelf storage, the rack storage being any one of single-row, double-row and multi-row rack storage; or, a commodity of Class III stored beneath a ceiling having a ceiling height ranging from 9.14m to 13.72m (thirty feet to forty five feet (30 ft. - 45 ft.)), the commodity having a storage configuration of any one of rack, palletized, bin box, and shelf storage, the rack storage being any one of single-row, double-row and multi-row rack storage.