Residential fire sprinkler with heat responsive trigger and deflective tines with slots

A residential fire sprinkler comprises a body defining a passageway 26 between an inlet 26A and an outlet 26B along a longitudinal axis with the outlet closer to an area to be protected than the inlet, the passageway having a rated K-factor of at least 6, the body including a portion having ¾ inch or greater NPT threads formed thereon, a closure positioned proximate the outlet opening so as to occlude the passageway 26, a heat responsive trigger 36 that retains the closure to occlude the passageway 26, at least one frame arm 14 being coupled to the body and a deflector coupled to the at least one frame arm 14 and spaced from the outlet opening so that when the trigger is actuated, the deflector provides adequate fluid distribution for the protection of a dwelling unit, the deflector including a first surface that faces the outlet and a second surface spaced apart from the first surface, a plurality of tines that extends away from the longitudinal axis, the plurality of tines being disposed generally about the longitudinal axis and two slots formed through the first and second surfaces, each slot including two generally parallel walls between a first end and a second end to define an opening extending along a first axis generally perpendicular to a plane defined by the longitudinal axis and the at least one frame arm, the two walls of the slot converging towards each other at the first end and the second end to define a close-ended slot 40 having a generally polygonal perimeter.