Product review (2 stars): LG HAS VERY UNRESPONSIVE SERVICE.
My wife and I bought a new LG 5170W dryer last fall. One of the major reasons we bought it was because they advertise it can be vented down through the floor. The manual that comes with the dryer also states it can be vented downward. After purchasing it, we discovered that  it did not have a knockout on the bottom, like it did on the sides and the back. As a result, we had to hire an installer to literally cut out a hole on the bottom to properly vent the unit. We called LG several times about the problem, and wrote an email and 2 letters, the last one addressing the President of LG USA, Kyu-Yu Moon, and never received a written response at any time. I only hope we don't experience any other problems with this LG dryer in the future.