After a 2 5/8 inch diameter hole is cut in the ceiling, the sprinkler is to be installed with the Model FC Wrench. This feature offers flexibility when sizing system piping and positioning the system piping with respect to the ceiling. Improper handling and installation can permanently damage a sprinkler system or its compo- nents and cause. than a standard sprinkler, and the pattern produces significantly higher wall wetting. Ceiling Slope Maximum 2-inch rise for 12-inch run (16. Sprinklers are designed to operate at substantially lower-end head pres-sures compared to ESFR sprinklers with 14.0 K-factors. to define a coverage area of the device of over than 132 sq. tion (e.g., smooth ceiling, bar joists, beam and girder, and so forth) Where the depths of solid structural members (beams and stem, for ex-ample) exceed 12 inches (302 mm), in - stall ESFR Sprinklers in each channel formed by the structural members. for a fluid pressure at the inlet of less than 500 psi. The preferred device includes means for diffusing the fluid at a flux density of less than 0.1 gpm/sq. The preferred device include a body having a passageway defining a K-factor of less than 1 gpm/psi1/2. The preferred mist devices provide for the protection of at least one of a light hazard occupancy only and a light and ordinary hazard occupancy having a ceiling with a maximum ceiling height of at least 8 ft. Three system configurations are defined by varying design criteria for the installation of: mist devices having an enlarged coverage area alone or in combination with known nozzles or sprinklers. Abstract: Various mist-type fire protection systems for the protection of light and ordinary hazard occupancies of reduced water demand as compared to known mist type systems or sprinkler systems configured to protect the same occupancies.