What is one requirement for downspouts in a mitigation system?

In a mitigation system, downspouts are crucial for redirecting water away from a building's foundation, which can help manage moisture and reduce the potential for radon entry. The requirement that downspouts should be only installed outdoors on the pressurized side aligns with the need for effective drainage.

When downspouts are located on the pressurized side, they help to ensure that water is directed away from the structure, minimizing the risk of creating conditions conducive to radon entry through the foundation. Installing downspouts indoors would not be advisable as it could lead to water pooling and contribute to moisture issues inside the home, potentially increasing radon levels.

Also, the requirement regarding size, material, and location focuses on creating a properly functioning system that enhances efficacy without compromising building safety or performance. This context underscores the importance of proper downspout placement in relation to radon mitigation strategies, supporting the notion that outdoor installation on the pressurized side is key in promoting proper drainage and airflow.