An airborne infection isolation room exhaust system is being designed with a HEPA filter upstream of the exhaust fan. The filter has a minimum efficiency of 99.97% based on the DOP method. According to the code, what is the impact on the required discharge distance from building openings?

• The distance is automatically reduced to 7 feet.
• The distance may be reduced, subject to approval by the enforcing agency.
• The distance remains 25 feet; no reduction is permitted.
• The distance must be increased to 50 feet.