The National Fire Protection Association (NFPA) has long required that pallet rack flue space remain clear at all times so that any fires can vent upward rather than outward, allowing sprinkler systems to activate faster. This vertical rise also helps slow fire spreading horizontally through a rack system. Flue space compliance is increasingly important to insurers and operators of warehouses and other industrial facilities. What can you do to help reduce issues with flue space obstruction?