On Friday, April 18th 4-7 am, facilities technicians and contractors will be working on preventative maintenance and repairs to the HVAC systems serving floors 7-11 of the vertical expansion. The supply and exhaust air to the 7th-floor BTCF and the exhaust air to all spaces on the 7-11 expansion will be affected. Please cap any materials and close the sashes in the fume hoods before the start of the outage.