Patent ID: 8887821

Claim:
A fire protection system installation for fire protection of an ordinary hazard beneath a sloped ceiling adjacent a vertical back wall, the ceiling having a slope defined by a maximum rise of four inches per one foot of run the system comprising: a liquid supply; and at least one sidewall sprinkler installed along the backwall beneath the ceiling, the sprinkler including: a tube having a proximal end and a distal end, the proximal end of the dry tube for connection to a liquid supply, the tube defining a dry passageway along a longitudinal sprinkler axis when the sprinkler is unactuated and providing communication of the liquid between the proximal and the distal end when the sprinkler is actuated; a sprinkler body coupled to the distal end of the tube, the body including a frame and a pair of frame arms extending distal of the frame, the frame defining an outlet in communication with the passageway for discharge of the liquid when the sprinkler is actuated; a deflector coupled to the frame arms and distally spaced from the outlet for distribution of the liquid discharged from the outlet, the deflector including a canopy portion radially spaced from the sprinkler axis, the sprinkler being installed such that the canopy portion is substantially parallel to the sloped ceiling so as to define a space therebetween of about six to twelve inches (6 in.-12 in.), wherein the liquid supply to the inlet of the at least one sprinkler being provided at a minimum pressure such that upon activation of the at least one sprinkler defines a minimum flow rate of the liquid ranging from about 38 GPM to about 64 GPM and a length of throw of liquid deflected off the deflector of about 16 FT to about 20 FT.