hvacr, I just checked your site, and you have a total of 8 posts for your entire forum. That's the answer. I'm guessing you simply don't have enough content to have your actual forum pages show up in google.
Google may spider your pages, but they don't always include all pages in their index. Only google really knows the true criteria as to what they use to have pages show up. With only 8 posts on your forum, most of which have less than 30 words or so, google probably just doesn't feel that it adds to their engine to have your forum listed at this time.
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