What document should be handed to clients relating to the safety of materials used in radon mitigation?

The correct choice is the Material Safety Data Sheet (SDS) because it provides crucial safety information about the materials used in radon mitigation. The SDS includes details on handling, storage, emergency procedures, potential hazards, and other important information that helps ensure the safety of those who are involved in the installation or maintenance of radon mitigation systems.

Providing clients with the SDS allows them to understand the risks associated with the materials, be aware of safe handling practices, and be informed of any necessary protective measures. This is particularly important in radon mitigation, where certain chemicals or materials might be used that have specific safety protocols associated with them.

While an installation guide offers instructions on how to properly set up the mitigation system, and a product catalog provides an overview of available products, these documents do not focus specifically on health and safety issues. A warranty document details the coverage and terms of service for the mitigation system but does not contain necessary safety information regarding the materials themselves. Hence, the SDS stands out as the critical document for client safety concerning material usage.