OEM Lennox Draft Inducer Orifice — 18J16

The genuine OEM Lennox 18J16 draft inducer orifice is a precision-calibrated component that meters the flow of combustion air and flue gases through your furnace's inducer assembly. By maintaining the correct pressure drop across the venting system, it ensures complete, efficient combustion and safe evacuation of exhaust gases from your Lennox gas furnace.

Common failure symptoms: A worn, clogged, or incorrectly sized orifice can trigger pressure switch faults, cause the inducer motor to short-cycle, prevent burner ignition, or produce rumbling and incomplete combustion. Homeowners often notice the furnace locking out on a fault code, unusual venting noise, or a system that repeatedly fails to reach temperature.

Why OEM matters: The orifice bore diameter is engineered to exact tolerances matched to your Lennox model's inducer and gas valve. A generic or improperly sized substitute can throw off combustion calibration, degrade efficiency, and create a safety hazard. Installing the factory 18J16 guarantees the correct airflow characteristics, restores rated performance, and preserves your equipment warranty. Every part ships same day when ordered before the daily cutoff.