What type of sprinkler head is designed to spray water away from a wall in a half-circle pattern?

A sidewall sprinkler is specifically engineered to be installed near walls and is designed to distribute water in a half-circle pattern that sprays away from the wall. This design allows for effective coverage in areas where a full pendulum of water is required but where it is impractical to install traditional upright or pendant sprinklers due to space constraints or other layout considerations.

Sidewall sprinklers are particularly useful in spaces like hallways, narrow rooms, or areas that might not have sufficient clearance for standard overhead sprinkler types. The unique arrangement of a sidewall sprinkler enables it to effectively protect these areas by directing water flow outward, optimizing their performance in protecting property and life safety.