Having seen fogging tombstones at several retail stores, I wanted to build one. I'm going to build it out of foam board. So here is my dilemma, how/what do I run the plumbing? I could use PVC, EMT, or Dryer Vent Tubing. I think the most obvious and easiest would be PVC, but want to see what others think. Have any of you built one of these and how did you do it? The less complicated the better as I want to build a couple different fogging tombstones.