What is the minimum distance from a hanger assembly to the centerline of a sprinkler head?

The minimum distance from a hanger assembly to the centerline of a sprinkler head must be at least 3 inches. This requirement is in place to ensure that the sprinkler system operates efficiently and effectively. The distance is important for a few reasons. First, it prevents potential obstructions that could interfere with the water spray pattern, allowing the sprinkler head to function properly. Second, adequate spacing helps ensure that the thermal elements of a sprinkler head can operate without interference from nearby structural components or hangers, ensuring timely activation during a fire event. This distance is established in the National Fire Protection Association (NFPA) standards, which provide guidelines to ensure both safety and performance in sprinkler system installations.