Rick,

The code changes excluded the use of PVC for drain pans and the 2006 reference now mandates CPVC for drain pans which are not expected to have high temp water in them anyhow.

The Dec 2007 Building Safety Journal by ICC had a short blurb on this in the "Significant Changes To The 2006 I-Codes" section. It was explained that this occurred because, in a nutshell, the original specification was put in the wrong code section of the IPC. When they moved it to the "correct" code section it referenced the new table which excludes the use of PVC.

In the same little blurb they did indicate that this was a "controversial issue and must be resolved during the structure's design". There was also additional wording that indicated they (ICC) are laying it back on the AHJ and installers to decide if PVC on a drain pan is acceptable.

That is the what I got from that "...Journal" blurb. Any other interpretations out there??