Originally Posted By: kluce
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I have come across drains from the A.C. coil connected straight into a sewer pipe in crawl. This is not allowed since the smells may work it’s way back to the A.C coil. The heating company disagreed and the builder believed the heating company. I looked up the information and gave it to the home owner and seen it corrected on the last inspection.
Without that information, the correction might of not happened. There was a chance the client would be confused and question my knowlaedge and ability.
This way I came out smelling like a rose and not the sewer. 
Note: I use to be a heating tech, I was aware of this being in the code book.
There are some Associations that will update the code as it comes out. But again, Expensive.