Pressurization of staircases and lift lobbies to keep escape routes smoke‑free during fire events. We size fans, relief openings and controls to maintain code‑mandated pressures without door opening issues. Compliances: NBC smoke control provisions; local fire authority requirements. Benefits: Safer evacuation, better fire NOC compliance, integration with FA/PA logic. Why Choose Us: Proven designs with field commissioning, pressure tests, and interlocks aligned to alarm stages.