There was concern regarding the temperatures of the areas around the control room. These spaces are supplied from AHU 3. The heaters which supply hot air for the hot deck operation were not running and have not been running for some time because the CFM set point of the AHU was below the duct pressure required to satisfy the flow switches. We increased the CFM from 12,000 to 14,000 CFM and this increased the duct pressure enough to satisfy the switches and enable the heaters. Bear in mind this will create a burning dust odor for a short time.