On Thursday, March 21st 4-6 am to perform preventative maintenance task on the HVAC systems serving the 4th and 5th floor facilities technicians will be shutting down supply and exhaust fans serving the areas. During this time occupants of the non BSL3 labs on the 4th floor and the 5th floor may experience a reduction of supply and exhaust air flow during the above-noted time. During this time NO work shall be conducted in any of the 4th Floor BSL3 labs.