Your design parameters are covered in ASHRAE Standard 62-2001, "Ventilation for Acceptable Indoor Air Quality."
To secure a copy of ASHRAE Standard 62-2001 or any of the other ASHRAE documents referenced in this guide, contact:
American Society of Heating, Refrigerating and
Air-Conditioning Engineers, Inc.
1791 Tullie Circle NE
Atlanta, GA 30329
Phone 1-800-527-4723 — publication orders only
Phone 404-636-8400 — technical inquiries
Fax 404-321-5478
Web
Ventilation Rate Procedure (Section 6.1) presents "...one way to achieve acceptable indoor air quality", namely, supplying each occupied space with ventilation air of specific quality and quantity. Outdoor air is used to dilute anticipated contaminants to acceptable concentration levels.
In contrast, the Indoor Air Quality Procedure (6.2) presents "...an alternative performance method...for achieving acceptable air quality" by quantitatively describing acceptable indoor air quality. It sets limits on the concentration of known and specifiable contaminants in an effort to achieve acceptable indoor air quality in the occupied zone in a more direct way that the Ventilation Rate Procedure. More specifically, the Indoor Air Quality Procedure sets concentration limits for 10 contaminants, prescribes subjective analysis to determine acceptable odor levels, and describes the use of treated recirculated air to reduce the minimum outdoor airflow rates presented in the standard
Your internal pressure must over come external wind pressure.
Inlet fans can be used for pressurized rooms
Also refer too NFPA 90A
