On 6/20, from 6 am to 3 pm, Exhaust Fan 8C will be shut down to facilitate the replacement of the variable frequency drive (VFD). During this outage, the following fume hoods will not have airflow and should not be used. Fume hoods, 1902,1905, 1906, 1911B, and 1914 on the first (1st) floor. Fume hoods 2902, 2903, 2916, and 2917 on the second (2nd) floor. Fume hoods 4929A and 4929B on the fourth (4th) floor. Thank you for your patience.