I saw an ATU building catch fire because they ran the tower feed through the wall in a PVC pipe. It got hot, melted and burned. -D From: RichardBJohnson at comcast.net polypropylene, polyvinyl-chloride, and Lucite (poly-ethyl-methyl-acrylate) will melt and burn. Cheers, Richard B. Johnson Book: http://www.AbominableFirebug.com/