NFPA 68 provides requirements for deflagration venting systems to mitigate the effects of explosions in enclosures. In the context of BESS, it applies when battery enclosures or rooms present a risk of gas buildup and explosion, particularly with chemistries that can release flammable gases. Proper venting design per NFPA 68 is essential for mitigating pressure and protecting equipment and personnel during a deflagration event.