Just wanted to share a picture of a radon system installed in our area, by a certified radon company. Radon fans have to be mounted vertically. Otherwise, the inside fills up with water, which will end the Radon fans life early. Piping on the outside also needs to be vertical on a Radon system. A foot or two or horizontal piping is OK if really needed, but for the most part, it should go vertically up the side of the home. If the Radon vent pipe is run horizontally outside for a long run it too will fill up with water and become ice in the winter. By looking at the picture you can see that the area in the basement had to be finished off where they wanted to run the pipe. I get running it next to the chimney for aesthetics, but the method is incorrect. Sometimes tough choices have to be made. They could have run it vertically, then painted it to match. Once a Radon system is painted to match siding they blend in very well.