What is the minimum distance below which sprinklers must be installed on high storage racks?

Sprinklers must be installed at a minimum distance of 25 feet below the highest storage point on high storage racks. This requirement is crucial because it ensures that the sprinklers can effectively deliver water to control and suppress potential fires that may ignite in the upper tier of storage. Adequate distance placement allows for proper water distribution and minimizes the risk of fire propagation, enhancing the overall safety of the building and its occupants.

The standards set for sprinkler installation height are based on fire behavior, storage configuration, and dynamics of water spray patterns. By adhering to the 25-foot rule, fire safety measures are optimized to provide a protective layer over the products stored in the racks and to promote rapid response to fires, which is vital for limiting damage and ensuring safety.

The other distances provided, such as 10 feet, 20 feet, and 30 feet, do not align with the recognized standard practices for high storage rack installations and could lead to ineffective sprinkler performance in case of a fire.