They may or may not stick out depending on the sprinkler s construction and the way it s mounted but each of these heads relies on piping along or behind a wall for a supply of water.
Wall mounted fire sprinkler head.
This heat sensitive plate detaches at temperatures roughly 20 degrees lower than the fire sprinkler head allowing the concealed sprinkler s deflector to drop and the head to activate.
The distance between light fixtures or similar obstructions located more than 8 ft 2 3 m from the sprinkler shall be in conformity with table 4 9 5 1 2 and figure 4 9 5 1 2.
Sidewall sprinklers on the other hand install horizontally often in a wall.
First sprinklers must be located so they are within the hot gas layer that develops near the ceiling during a fire because activation occurs when the sprinkler head reaches a certain temperature.
Pendent sprinklers the most common type point down from a ceiling or beam.
Concealed models install in walls or ceilings and fully cover a pendent or sidewall sprinkler head using a concealed fire sprinkler cover plate.
In your case this would means that if there is storage under your cage you don t need to provide a sprinkler protection below it and everything is fine.
Sidewall sprinklers shall be installed no closer than 8 ft 2 3 m to light fixtures or similar obstructions.