Which option best describes a sprinkler mounted horizontally on sidewalls?

• A. A type of sprinkler installed on ceilings
• B. A sprinkler with a deflector
• C. A sprinkler mounted on vertical walls
• D. Sprinkler mounted horizontally on sidewalls

Answer: (D)

The main idea is how the sprinkler is mounted and how that affects the spray direction. A sprinkler mounted horizontally on a sidewall is a sidewall sprinkler. It is attached to a vertical wall near the ceiling, with the head oriented so the water is discharged in a horizontal plane across the room. This design directs the stream along the space rather than straight down from the ceiling, which is different from ceiling-mounted heads (pendant or upright) that spray in a vertical path. Sidewall sprinklers are chosen when wall mounting is more practical due to room layout or obstructions near the ceiling, and they provide effective coverage by delivering water across the room from the wall.