This project involves replacing the steam tunnel ventilation system at NIST in Boulder, CO with two natural gas indirect fired make-up air units. It is a 100% Small Business Set-Aside under NAICS 236220, with a size standard of $45.0 million. The work includes removing existing equipment, installing the new units, and all associated systems for a complete, operational ventilation system. Performance is planned between May 1 and October 31 to avoid pipe freezing. No specific budget amount or submission timeline is provided.