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How to distinct filled face vs non-filled face for surface area calculation


I have a tube with multiple sections and I would like to calculate each section's surface area automatcially.

Problem: when I pass the faces of the tube, NX also reports the are of the faces which are not filled. 


Example:  I have a tube with 2 devided sectional tubes as shown in the picture. I only want to pass face A and face B of the sectional tube #1 and sectional tube # 2 into my program. However, I do not how to filter face A1, A2, B1, and B2 (end of sectional tube #2)