When owners have mentioned that their clothes dryers are not doing a good job, I have explained the only method that I know of to eliminate the problem. Here is a modification that is being discarded. The original vent tubes are between the walls into the attic. When they become clogged, and eventually they all do, owners have bypassed the original system with this apparatus. The PVC pipe stands beside the dryer and vents into the attic. This one has an elbow at the bottom to rest on the floor to support the weight of the pipe. Since the old vents are between the walls it is debatable whether or not the vent is a common element. When units are remodeled the old coiled vents are removed and replaced with smooth pipe material.