4 types of fire sprinkler are :- 1. Fire Sprinkler Pendants - This is most common type of sprinkler heads. Pendant sprinkler heads descend from ceiling with convex, circular, gapped deflector plate or bottom. There are many variations of the pendant and effective in protecting variety of buildings and spaces, from industrial buildings to daycares. 2. Concealed Pendant - When a pendant sprinkler head is recessed into ceiling and concealed by decorative cap that blends in flush with the ceiling. 3. Upright Sprinkler Heads - Sprinkler heads that point upward toward the ceiling with a circular, concave deflector plate on top. 4. Sidewall Sprinkler Heads - Protrude horizontally out of wall parallel to the floor, rather than descending from the ceiling or mounted on pipe pointing upward.