The fume hoods in Mackenzie Chown H and F block will be shut down on Saturday.The hoods will not be operational between 7 a.m. and 4:30 p.m. The shutdown is for annual fall repairs on the exhaust systems.Facilities Management advises that: All hood enclosures should be empty. If this is not practical, all bottles and containers in the hood must be closed tight. All containers in vented cabinets under hoods should be closed. This should be normal practice. Hoods that are not vented to the outside can be used (one filtered fume hood in Earth Sciences, all laminar flow hoods and all bio-containment hoods).Direct questions or concerns to Facilities Management customer service at 905-688-5550 x3717 or firstname.lastname@example.org.Direct safety-related issues to Andy Prankevicius, research and academic safety officer, at 905-688-5550 x5390 or email@example.com.