The Rheem AS40132 Plenum Back - Ventmaster is an essential component for Rheem water heating systems, designed to facilitate proper venting and airflow. Constructed from high-quality materials, this plenum back ensures durability and compliance with industry standards. Its design allows for efficient heat distribution, enhancing the overall performance of your water heater. The plenum back is easy to install and compatible with various Rheem models, making it a reliable choice for upgrades or replacements. Optimize your water heating system's efficiency with this essential venting component.