The Assy-Right Side Inner Door Ultra Low NOx 18" from Bradford White is engineered for high-efficiency water heaters. This component is designed to meet stringent emissions standards, ensuring ultra-low nitrogen oxide (NOx) output. Constructed with high-quality materials, it provides durability and effective insulation. The 18" size fits specific Bradford White models, making it a perfect replacement part for maintaining compliance and performance. This inner door assembly is crucial for optimizing the efficiency of your heating system while adhering to environmental regulations.