Outdoor Systems...

When we install a radon-mitigation fan outside of the house, it's called (not surprisingly) an outdoor mitigation.  About 90% of the systems we currently install are sited outdoors; we take great pride in custom-designing them to fit with each home's design elements.

The primary advantage of this approach is that it puts most fan noise outdoors. But condensation can also be an issue: Because the exhaust system eliminates ground gasses at an ambient temperature of 50 degrees, these pipes can sweat and drip internally in the winter and externally in the summer. By locating the system outside, this is no problem.

Outdoor systems also require less in the way of materials and workmanship than their indoor counterparts, which typically makes them less expensive. They are generally shorter in total length, minimizing resistance; theoretically, the lower the resistance, the better the system's performance. Finally, if there's ever a problem, the system can be easily serviced even if the owner is not at home.

Like any radon-mitigation system, outdoor installations must meet strict protocols and codes. EPA/ASTM protocol demands that the fan be sited in a non-livable space, with the exhaust ending at least 10' off the ground, and at least 2' above any windows. If there are second-story windows, the exhaust must be at least 10' away from any window that can be opened, or again, 2' minimum above those also. Electrical codes also demand that an electrical shut-off be provided outdoors, within 6', or arm's length, of the fan.