and bore size match exactly

Always verify the model and serial number to ensure a correct fit before installation

Common Questions Which cores are compatible with the STAS969T

Common indicators include the humidifier not filling with water

facilitating rapid field installation without mounting modifications

Lennox 58W13 Gasket Refrigerant and bore size match exactlyThe Lennox 58W13 Header Box Gasket is a critical OEM replacement part engineered for high efficiency gas furnaces where maintaining an airtight seal is non negotiable. This furnace header box gasket is specifically designed to eliminate bypass air and prevent flue gas leakage at the secondary heat exchanger interface. As a technician, you know that a compromised seal here doesn't just degrade AFUE ratingsit leads to pressure switch trips and potential