D02 · Active sub-slab radon system — exterior route

ALT TEXT
Labeled diagram of an active sub-slab radon system routed through the foundation to an exterior fan and exterior vent riser.

LONG DESCRIPTION
Cross-section of a basement home with a suction point beneath the slab. The vent pipe passes through a sealed foundation penetration to an exterior riser and exterior fan, then discharges outdoors. A pressure indicator is visible indoors and a separate radon test is shown. Exact weatherproofing, clearances, slope, pipe size, and electrical details are intentionally omitted.

Source basis: U.S. EPA Consumer’s Guide to Radon Reduction (2025); current ANSI/AARST and local requirements control placement and dimensions.
