OEM Lennox Draft Inducer Gasket — 46K90

The genuine OEM Lennox 46K90 draft inducer gasket forms the airtight seal between the draft inducer motor housing and the furnace collector box or venting assembly. On Lennox gas furnaces, the inducer creates negative pressure to safely pull combustion gases through the heat exchanger and out the flue, and this gasket is what keeps that pressure boundary intact. Even a small seal failure lets flue gases and air leak past the joint, undermining safe and efficient venting.

Common symptoms of a worn or cracked 46K90 gasket include a whistling or air-rushing sound near the inducer, pressure-switch faults that lock out ignition, nuisance error codes, and reduced heating performance. Hardened, brittle, or crushed gasket material after years of heat cycling is a frequent culprit.

Choosing the OEM Lennox 46K90 gasket ensures the exact thickness, bolt-hole pattern, and high-temperature material Lennox engineered for your specific inducer assembly. Generic substitutes may not seal correctly, risking pressure-switch problems or combustion-gas leaks. Installing the factory-specified part restores a proper seal and protects the safe operation of your Lennox furnace.