A fire protection sprinkler includes a sprinkler frame and a deflector. The deflector is coupled to the sprinkler frame and distributes fluid discharged from an outlet of the sprinkler in a spray pattern centered about a sprinkler axis and defined by a fluid density in a first quadrant area 2.5 feet (ft.) below the sprinkler and perpendicular to the sprinkler axis, the first quadrant area having a first corner disposed along the sprinkler axis with a first edge extending in the direction of a fluid supply pipe, a second edge extending perpendicular to the first edge and intersecting the first edge at the sprinkler axis, the first quadrant area being defined by a grid of one square foot areas totaling an area of no more than 10 ft.×10 ft., the total fluid density being at least 15 gpm/sq. ft.