Underground radon fan installation

Hello fellow soldiers. I have sold a job without doing my homework. tisk tisk. Is anyone aware of a waterproof subgrade box that would accomadate a radon fan. Here is a brief explanation… A through the wall penetration approx 2′ below grade into some sort of container (the best I have come up with is a sump crock and sealed lid) and then exhaust vertically through the lid. I appreciate any advise. Thanks…Brett