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1• <br />EXHAUST <br />Observations <br />• Most exhaust fans on the <br />automation system appear to be <br />controlled via temperature control <br />sequencing. Those not on the <br />automation system are controlled <br />via local switch controls. There <br />are some units that appear to be <br />interlocked with a make-up fan <br />(SF-1,SF-2) <br />Recommended Action <br />• Obtain control of all exhaust <br />fans and program as able to <br />keep the air exchange moving. <br />The EFs interlocked with <br />Supply Fans may need to have <br />the interlock separated <br />depending if the Supply Fan air <br />can be tempered. Ensure fans <br />are always running while the <br />RTU associated with the area <br />is running. <br />At a Glance <br />Impact <br />• Automating exhaust fans allows <br />for the implementation of <br />ventilation strategies and <br />management of building pressure. <br />• After control has been • Increasing air changes via <br />• Night Purge is not enabled for obtained as detailed above, coordinated Night Purge and <br />any of the areas. add night purge sequencing <br />exhaust fan operation helps <br />with exhaust fans when promote elimination of undesired <br />schedule is unoccupied. <br />air contaminates. <br />• Building pressure sensors are <br />in place as part of the RTU <br />control sequences. <br />• Once sequences for <br />additional air intake and night <br />purge are put in place, monitor <br />static pressure to determine if <br />additional exhaust control <br />strategies are necessary <br />• Measurement of building <br />pressure allows for the practice of <br />ventilation strategies without <br />creating excessive pressure <br />conditions. Further controls <br />strategies can be proposed after <br />monitoring pressure control in <br />updated outdoor intake sequences <br />