Provided design-build services for a 100% outside-air, variable-speed exhaust, and oxygen sensor life-safety upgrades project. Project included a complex lead-lag variable speed fully-automated exhaust system that adjusts when oxygen levels drop to a pre-determined level. The 100% outside-air HVAC system provides employees with a safe and comfortable working environment with additional capacity to adjust for future facility expansion. System and alarms were tied into existing facility BMS system for continuous monitoring and alarm notification.