York S1-010-06900-001 Heat Exchanger Gasket

The York S1-010-06900-001 Heat Exchanger Gasket is a sealing component used between heat exchanger sections in furnace assemblies, ensuring separation of combustion and airflow paths in HVAC systems. It is commonly used within gas furnace heat exchanger compartments where controlled sealing is required for stable operation. It operates by compressing between mating metal surfaces to maintain a tight barrier that supports consistent heat transfer and limits internal leakage. Positioned during furnace service work, it assists steady thermal output, improves system consistency, and reduces irregular cycling caused by seal loss.