NFPA 13R: Sprinkler Systems for Low-Rise Residences Practice Test

The main idea is that pendent sprinklers must have sufficient clearance from nearby obstructions so their water spray can develop properly and reach the space below. The required minimum is three feet from any obstruction that could block or deflect the spray, such as walls, beams, lighting, or ducts. If something is closer than three feet, the spray pattern can be interrupted and coverage may be inadequate. Pendent sprinklers are mounted from the ceiling, not on walls, so installation on walls isn’t correct. The 3-foot clearance is the standard, not 2 feet. And pendent heads aren’t limited to dry pipe systems; they’re used with various system types, including wet systems common in low-rise residential buildings.