Lennox 43L21 Turbulatory Assembly 319825-402 or both for differential air

or both for differential air pressure measurements

Common symptoms include a pilot that won't stay lit

protecting both the heat elements and the dwelling

which can cause intermittent fault codes

ensuring the shroud clearance and hub depth meet original equipment tolerances for quiet

Lennox 43L21 Turbulatory Assembly 319825-402 or both for differential airThe Lennox 43L21 Turbulator Assembly is a critical OEM replacement part designed to optimize thermal performance within the heat exchanger of Lennox gas furnaces and unit heaters. Engineered from heat resistant Pyrolite, this 8 inch by 1. 8 inch technical component is strategically placed within the heat exchanger tubes to disrupt laminar flow. By inducing a consistent swirling pattern in the flue gases, the turbulator assembly effectively eliminates