Product review (1 stars): Waste of time and money.
This thing is junk!

Its super flimsy, and even with vent tape leaks air.  It looked like a great space saver, but in reality was a pain in the but to mesure, cut and install at the correct height.  Once installed and tested it leaked worse than a soaker hose.

Save your money, and stick with regular vent hose.  I think there is a reason why no brick and mortar store sells these.