Johnson Controls’ Tyco Model ES-1 and ES-2 sprinkler shields are for the protection of in-rack early suppression fast-response sprinklers in storage facilities and warehouses. The all-metal shields work to protect sprinkler elements from cold soldering, which occurs when cascading water from ceiling-mounted and high-mounted in-rack sprinklers cool down and inhibits the operation of in-rack sprinklers mounted at lower heights, the company explains.