Our schedule for the fall semi annual cleanroom PM is set for September 4 and 5, 2007 starting at 7:30 AM. The east & west lab PM is set for September 6, 2007 starting at 7:30 AM. All cleanroom and labs processes will be shut down during these times. During the Cleanroom shut on September 4 & 5 the following systems will be down affecting the ENTIRE BUILDING, due to no chemical exhaust systems. - Ultra pure water - All toxic gases - H2 generator Both east and west lab wings will down all day on September 6. Since the chemical exhaust systems will be down, all chemicals are required to be removed from all fume hoods prior to 4:00 P.M. on the day before the PM start date (Cleanroom Sep 3 and Labs Sep 5). Any chemicals left in fume hoods after this time will be remove prior to shut down. Thank you for your patients in this manner. Regards, Mark Voorhis Building Manager Purdue University Birck Nanotechnology Center Ph: 765-494-3036