Product review (5 stars): Duct Exhaust
This is an excellent product to use if you want a quick solution to hook up a clothes dryer from your dryer to a rigid duct 4"exhaust system leading outside. The key word is "Semi-Rigid" flexible, instead of just "Flexible". The semi-rigid duct extension will bend without creating the valley's or grooves the way flexible duct extensions do. This is important because there will be less lint trapped in the duct line, which could create a fire hazard if the duct is not cleaned regularly. I would recommend this product for the use I have stated.