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The genuine OEM Lennox Y5343 heat exchanger kit (cross-references to Dunkirk part 550002274) is a complete factory replacement for compatible Lennox and Dunkirk-built heating equipment. The heat exchanger transfers combustion heat into the circulating air or water loop while sealing hazardous flue gases away from the living space — making it one of the most safety-critical components in the system. This kit includes the exchanger assembly and associated hardware for a proper installation.
Common failure symptoms: cracks, pinholes, or corrosion in the exchanger, an unstable yellow flame, soot buildup, rumbling or banging at startup, unusual odors, and carbon monoxide alarms. A failed exchanger is a safety hazard requiring prompt replacement.
Why OEM matters: The OEM Y5343 kit is engineered to the precise metallurgy, dimensions, and pressure ratings specified for your Lennox/Dunkirk unit. That exact match restores rated efficiency, ensures a leak-free seal, and protects your equipment warranty — assurances aftermarket parts cannot reliably provide.