It is important to ensure that high purity Nitrogen is equally distributed within the entire FPS piping system. To do so, Huguenot Laboratories recommends installing the AutoPurge System (APS) . This Patent Pending technology provides the optimum Nitrogen Purging levels within your FPS system. This Patent Pending technology provides a low volume, constant purge of Nitrogen within your Fire Sprinkler Systems. The rate of which gas is evacuated from the FPS is within NFPA guidelines yet allows "breathing " to occur. Computational Fluid Dynamics (CFD) Modeling proves that this is the MOST effective way to ensure that high purity Nitrogen reaches all branches within the FPS and also assures that "Drying" out of residual water is maintained after a hydro or trip test is completed.