ANSI AARST CCAH-2020 Rev. 5/23 PDF
The purposes of this standard shall be as follows:
1) To specify radon control methods and techniques for use in dwelling units to reduce indoor radon concentrations to below the National Action Level (NAL) of 4.0 pCi/L [150 Bq/m3].
2) To provide minimum requirements for the rough-In of radon control system components in new dwelling units under construction and activation of the radon control systems, if required.
3) To provide a model set of requirements for adoption by states and local jurisdictions.
4) To provide a means for authorized personnel to inspect and evaluate rough-In components of radon control systems and activated radon control systems in new construction.
This standard shall be applicable only to in newly constructed one- and two-family dwellings and townhouses.
