A designer submits details showing that a proposed outdoor air intake location, which is 15 feet horizontally from an exhaust outlet, uses special filters to achieve equal performance to the code's standard separation distance. According to the exceptions in Section 407.2.1, is this an acceptable basis for approval?

• No, special filters can only be used to reduce vertical separation distances, not horizontal.
• Yes, provided details and calculations demonstrate the use of special filters provides equal performance.
• Yes, but only for skilled nursing facilities, not for hospitals.
• No, the 25-foot horizontal separation is an absolute minimum and cannot be reduced.