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Radon mitigation systems use a lot of readily available fittings from the plumbing industry. When we say 3” or 4”, these are not always the nominal dimensions. We are referring to schedule 40 PVC, which is the radon industry standard in North America. So, for example, 4” PVC fittings fit 4” radon fans using 4” couplers (most of these fittings have 4.5” inner diameter, since schedule 40 PVC is 4.5” OD). The same goes for our 3D printed parts (more info here). Other acceptable materials include steel downspout. 3” x 4” steel downspout is most often used. We can ship this material but it’s often more economical to search “roofing supply near me” and find local 10’ sticks. The downspout connections are rare and you should source those from us here.
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