Viking Early Suppression Fast Response (ESFR) Pendent Sprinkler VK510 incorporates the capability to suppress specific high-challenge fires. The addition of a larger K-Factor allows ESFR performance at lower end-head pressures than ESFR K14 sprinklers. K25.2 ESFR sprinklers can:   -Eliminate the use of in-rack sprinklers when protecting high-piled storage of certain specified materials up to specific heights.   -Reduce or eliminate the need for a system fire pump.   -Provide flexibility when sizing system piping.