Warehouses & Distribution
Fire Suppression

ESFR (Early Suppression Fast Response) sprinklers are high-flow, fast-acting heads designed to suppress fires in high-bay storage before they grow to uncontrollable size. Their design depends on delivering a large volume of water directly onto burning product — but only if there are no obstructions between the sprinkler and the fire. Even a single beam, duct, or misplaced pallet within 18 inches of an ESFR head can disrupt the discharge pattern and defeat the suppression design. This makes obstruction inspection especially critical in ESFR-protected warehouses.

Potentially yes. NFPA 13 classifies stored commodities from Class I (lowest hazard, e.g., non-combustible goods in cardboard boxes) to Class IV (highest hazard, e.g., plastics, rubber). If you switch to a higher commodity class, your existing sprinkler system may be inadequate for the new storage. Before changing what you store, especially if adding plastics, aerosols, or flammable liquids, have your contractor evaluate whether the current system design is adequate.

NFPA 13 uses storage height as a key variable in sprinkler system design — higher storage generally requires higher water density or in-rack sprinklers. If you raise your racking above the design height in the original system calculations, the system may no longer provide adequate protection. Any significant change in rack height should be reviewed by a licensed fire protection contractor or engineer before implementation.

Yes. Standard wet pipe sprinklers cannot be used in areas subject to freezing temperatures. Dry pipe systems (filled with pressurized air until activation) or antifreeze-loop systems are used in freezers and cooler spaces. Both require different maintenance than standard wet pipe — dry pipe valves must be tripped and tested, and antifreeze solutions must be tested annually for proper freeze protection.