Rinnai 500mm Flue Extension – For 11i, 17i & HD55i Non-Condensing Water Heaters (AWF50-05) The Rinnai AWF50-05 500mm Flue Extension is designed to extend the horizontal or vertical flue run of Rinnai 11i, 17i, and HD55i non-condensing gas water heaters. This high-quality extension is ideal for installations that require longer venting distances, ensuring safe and efficient discharge of combustion gases. Manufactured to Rinnai’s strict quality standards, this 80/125mm coaxial flue extension maintains full system compatibility and compliance with manufacturer guidelines. Perfect for indoor or confined-space installations where standard flue lengths are insufficient. Key Features & Benefits: ✅ 500mm Extension Length – Adds extra reach t