Just saw this system. Look at the two pics. The installing company did not know what the building codes are. We are not allowed to cut out the bottom of a joist. It takes away the structural integrity of the joist. The way it has to be repaired is to place a steel plate on both sides of the joist and then bolt them onto it. The will no longer allow space for the Radon vent. The owners, who are selling the home found this out upon the home inspection. The piping on the other side is now behind finished space, which means they have to cut that apart and repair it also to remove the piping. Then a new Radon vent has to be installed from scratch. All because the other company did not know what the codes were. This comes down to proper training when getting certified to install Radon systems. That is the beginning. From there one has to be trained on what they can and can not cut through. Do your research. Hire a company that has proper training. We at Radon Specialists of Wisconsin have. In addition to being certified for Radon I am also a licensed builder.