Reducing Radon in New Construction of ANSI/AARST CCAH 2020 1 & 2 Family Dwellings and Townhouses 20 Understanding the System Pressure Gauge: The pressure gauge shown on the right is typical of a gauge used to monitor the pressure developed in the piping system by the radon fan. Your fan pressure should be checked regularly to ensure the fan system continues to operate properly. This gauge measures pressure in Inches Water Column ( in. WC ). This gauge does NOT measure radon . Call for service if the measure changes substantially (20% or more) or if the gauge reads zero pressure (both columns equal). Your ASD system also has a means to alert you of fan failure such as an audible alarm or other means. Follow instructions provided with the system for deactivation of alarms and servicing. Radon Testing: Be certain to complete a radon test after occupancy of your new home. The way you and your family live in your new home, how you set heating and cooling controls or use your clothes dryer and other exhaust fans can affect indoor radon levels. It is recommended that you conduct a long-term test—for 3 months or longer—to gain a better understanding of your radon exposure in the home. Be sure to complete your testing before the end of your new home warranty period. Follow the instructions provided by the test laboratory to open, activate and place the test kit to test your radon levels. The USEPA recommends that you retest your home at least every 2 years or if major renovations or additions are made to the dwelling . Other sources of radon: Radon can also be found in the water from private wells. Testing can determine if your well contains significant amounts of radon . More Info: For more information on radon , radon testing or radon removal can be found at and the radon hotline 1-800-SOS-RADON (767-7236) or at your local state radon office. NOTE: Exhibit 2 may be reprinted without license from AARST.