System Type 9 Baseline Fan Sizing

I am working on a job with the Army Corps of Engineers that has a vehicle maintenance workbay with general exhaust requirements of 1.5 CFM/SF dictated by the RFP. We are to provide makeup air to maintain a slight negative pressure in the space via a hot water make up air unit. The airflow rate in the proposed case is being dictated by the exhaust requirements in the RFP. Appendix G states that the baseline fan sizing for System Type 9 shall be based on the required air with a 105 discharge air temp, minimum outside air, or "as required to comply with applicable codes or accreditation standards." My question is can I model the airflow identically in the proposed and baseline cases as the airflow is dictated by the RFP (could this be considered an accreditation standard as the Army Corps of Engineers are dictating this design criteria?) Any help would be greatly appreciated!