What distance should radon testing be conducted from an exterior opening?

Radon testing should be conducted at a distance of 36 inches from any exterior opening. This distance is important because it reduces the possibility of outdoor air affecting the radon measurements. Exterior openings, such as windows and doors, can introduce fresh air or influenced the air pressure dynamics within a building, which can lead to misleading results in the radon concentration readings.

By positioning the testing device at least 36 inches away from these openings, you can better ensure that the radon levels measured are representative of the air quality in the living space and not skewed by environmental variables outside the structure. This distance provides a balance, ensuring that the test is done in a location where the influence of external air flow is minimized while still being in close proximity to where occupants typically spend their time. This overall approach helps in obtaining an accurate assessment of radon levels, which is crucial for effective radon mitigation strategies.