What does the ANSI-AARST standard specify about rain caps at the ASD discharge point?

The ANSI-AARST standard specifies that the exhaust point must be at least 15 feet above grade. This requirement is in place to ensure that radon gas, which can accumulate in homes and pose health risks, is effectively vented away from living spaces. By requiring the exhaust point to be elevated, it helps to promote dispersal of any radon emanating from the system, reducing the likelihood that it will re-enter the home.

In addition to helping mitigate radon levels in indoor environments, this height requirement is also intended to minimize the potential for creating pathways where radon can enter the building through operable openings, such as windows or ventilation systems. Ensuring that the exhaust is sufficiently high helps to keep the gas away from areas where people are likely to be, enhancing overall safety.

Therefore, adhering to this standard is crucial in effective radon mitigation strategies, contributing to healthier indoor air quality.