
Maintain peak thermal efficiency in your hydronic system with the Lochinvar FIB2168 insulation door, engineered specifically for Knight XL KBN 399/500 boilers and AWN water heaters. This replacement panel prevents energy waste by sealing the combustion chamber, ensuring that internal temperatures remain consistent for optimized burner performance.
This component utilizes specialized thermal barriers to reduce convective and radiant heat loss from the boiler chassis. By creating a high-performance seal, the insulation door helps the appliance reach its rated recovery capacity faster while lowering ambient equipment room temperatures.
Key System Performance Baselines:
- Thermal Retention: Minimizes heat transfer from the combustion zone to the exterior cabinet.
- Energy Efficiency: Supports the high-efficiency ratings of Knight XL systems by eliminating convective leakage.
- System Durability: Protects external cabinet components from exposure to excessive internal heat.
⚠️ Application Profile: Use this insulation door specifically for service and restoration of Lochinvar Knight XL KBN 399/500 heating boilers and AWN series commercial water heaters.
| Performance Parameter | Engineering Baseline Value |
|---|---|
| Manufacturer Part Number (MPN) | FIB2168 |
| Compatible Equipment | Knight XL KBN 399/500, AWN Series |
Corporate Procurement & PO Processing
Formal Purchase Orders (POs) and tax-exempt ordering are accepted for commercial contractors and institutional facilities.
Apply for Trade Account & Terms →📋 Procurement & Shipping Notice
- LTL Freight Dispatch: Heavy commercial units ship directly via insured LTL carrier with delivery coordination included.
- Project Timelines & Submittals: Need guaranteed delivery dates, formal submittals, or tax-exempt processing?
👉 Request a Commercial Quote or contact our procurement team for direct freight scheduling.