Lennox 25W71 Gasket 326058-757 though installing with the lid

though installing with the lid facing down is the preferred method to simplify debris removal

Smith models are compatible with this cleaning kit

7 microamps minimum) to prevent late-ignition scenarios

Field-Ready Kit: Includes mounting hardware and gaskets to minimize downtime during service calls

Lennox 25W71 Gasket 326058-757 though installing with the lidThe Lennox 25W71 Gasket is a critical OEM replacement part designed specifically for sealing the collector box cover in high efficiency Lennox furnaces. As a veteran tech knows, a compromised seal at the secondary heat exchanger leads to pressure switch trips and dangerous flue gas leakage. This precision engineered furnace collector box gasket (also indexed under 100742 01) ensures an airtight, negative pressure environment required for the draft