Dear BNC User This is a short notice shutdown of the west lab wing chemical exhaust system. One of the two exhaust fans that supply laboratory chemical exhaust for the west laboratory wing has a failing bearing that needs to be replaced as soon as possible. We plan to do this work on Wednesday May 31, 2017 from 8:00 AM to 4:00 PM. All west wing 1st & 2nd floor laboratories activities that involve exhausted hoods, vacuum systems, and/or toxic gas systems will be down during this time. However, work that involves taking standard electrical measurements may be carried out in the laboratories provided that fluctuating air temperature and humidity do not affect the readings. No chemical work will be allowed during this period. The west lab wing chemical exhaust shutdown will not affect the cleanroom or east wing laboratories those areas will remain operational during this shutdown. Mark Voorhis Building Manager Purdue University Birck Nanotechnology Center Office: (765) 494-3036