I was helping on an install the other day ( normaly run service truck). I was asked by my boss to install the dryer vent. He told me to use PVC for the vent. I informed him that PVC is not sutiable for dryer vent according to the International Mechanical Code or the Kentucky residential code. I was told by my boss that they have been using PVC for a few years and have had no problems. I did do the install as I was ordered to do. However this has bothered me ever since. Does any one know if PVC can be used for a dryer vent ?