Where are sidewall sprinklers typically installed?

• A. Installed inside walls.
• B. Installed beneath decks with specific deflector height.
• C. Installed on ceilings.
• D. Installed in attics.

Answer: (B)

Sidewall sprinklers are designed to be mounted on a wall so the deflector sprays horizontally across the room. In low-rise residential layouts, there are situations like spaces under decks where there isn’t a usable ceiling to mount a sprinkler. In those cases, the head is installed beneath the deck with the deflector set at the correct height to ensure the discharge pattern protects the under-deck area. This installation approach matches how sidewall heads are intended to operate, providing effective coverage without relying on a ceiling-mounted configuration. Installing them inside walls, on ceilings, or in attics would not provide the proper spray pattern or accessibility that sidewall sprinklers require.