Wing 6 of Building 1 at the National Institute of Standards and Technology has mixing boxes throughout this wing of building 1. This wing of the building has tight temperature and relative humidity requirements. The existing system was on its last leg, so Timberline was contracted to replace the system with a built-up heating water, chilled water, and humidification system. This was a challenging job due to its location, but the Timberline team was able to execute on schedule.