Product review (4 stars): 5 inches deep) were perfect for our application
It does it's job well. Saves me space behind my dryer where I don't have much space to give up. This (in conjunction with an LG dryer -- they are the only brand that I know of which makes dryers only 27.5 inches deep) were perfect for our application. Other have commented that this thing leaks a lot of air. Perhaps they weren't intended using some foil duct tape on the seams. With a few sheet metal screws to hold it in the right location and then taping all the seams, it's great. In my opinion, it's not at all unreasonable to have to tape the seams -- that's completely normal when working with metal ducting.