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Here are some things to explore...

• For the 5 OA (outdoor air) ACH, set your DesignSpecification:OutdoorAir object to 5 ACH. Make sure your ceiling height is properly defined in your ThermalZone. Set 'Control For Outdoor Air' to 'YES' in your AirTerminal:SingleDuct:VAV:Reheat.
• For the 10 Total ACH, in your AirTerminal:SingleDuct:VAV:Reheat set your 'Zone Minimum Air Flow Input Method' to 'Fixed Flow Rate' and then convert your 10 ACH to CFM and enter in 'Fixed Minimum Air Flow Rate' field. Additionally, the the Sizing:Zone object, set the 'Cooling Design Air Flow Method' to 'DesignDayWithLimit' and then specify the 10 ACH (converted to CFM) in the 'Cooling Minimum Air Flow' field.

Here are some things to explore...

• For the 5 OA (outdoor air) ACH, set your DesignSpecification:OutdoorAir object to 5 ACH. Make sure your ceiling height is properly defined in your ThermalZone. Set 'Control For Outdoor Air' to 'YES' in your AirTerminal:SingleDuct:VAV:Reheat.
• For the 10 Total ACH, in your AirTerminal:SingleDuct:VAV:Reheat set your 'Zone Minimum Air Flow Input Method' to 'Fixed Flow Rate' and then convert your 10 ACH to CFM and enter in 'Fixed Minimum Air Flow Rate' field. Additionally, the in the Sizing:Zone object, set the 'Cooling Design Air Flow Method' to 'DesignDayWithLimit' and then specify the 10 ACH (converted to CFM) in the 'Cooling Minimum Air Flow' field. field.