I had installed a huge radon system in the summer, which spanned the width of this home. Due to the route of the pipe between the walls, I did not have the luxury of angling the pipe toward the floor opening to drain ex

cess water from condensation near the fan. As a result, water was bui

lding up in the pipe beneath the fan housing, resulting in reduced efficiency.
As a solution to the problem, I built a one-way drain valve (Dranjer) into a section of pipe, and installed it beneath the fan housing. So far, it's been working very well!