During a routine inspection of the HVAC system, the building technician noticed a noise different from normal coming from the air handling unit serving the 4th floor. After an investigation, it was determined that the supply fan in the unit needs to be repaired. In order to complete the repair, the HVAC system will be out, affecting all areas on the 4th floor on the dates and times noted below. During these times, NO work shall take place in any BSL3 lab on the 4th floor.