The CAST BOOT-COMBUSTION AIR ENTRY PDX 22"D is a robust component designed for efficient combustion air entry in Bradford White water heaters. This cast boot is engineered to facilitate optimal airflow, enhancing combustion efficiency and overall system performance. Constructed from high-quality materials, it is built to withstand harsh conditions and meet industry standards for safety and reliability. Its 22-inch diameter design ensures compatibility with various models, making it an essential part for maintaining the efficiency and safety of your water heating system.