D01 · Active sub-slab radon system — interior route

ALT TEXT
Labeled cross-section of an active sub-slab radon mitigation system with an interior vent route, fan, pressure indicator, outdoor discharge, and separate radon test.

LONG DESCRIPTION
Cross-section of a basement home with an under-slab suction point connected to an interior vent pipe. An in-line fan is shown in a non-living upper zone, airflow exits outdoors, a U-tube pressure indicator is attached to the vent, and a separate indoor radon test is shown. Dashed arrows show soil gas moving toward the suction point. No dimensions are specified.

Source basis: U.S. EPA Consumer’s Guide to Radon Reduction (2025); Iowa Chapter 44 only where an Iowa overlay is stated.
