Lennox Hearth 90UGF Series is a gas furnace designed to provide warmth and comfort in your home. It features a SureLight ignition system that automatically lights the burners, eliminating the need for manual lighting. The furnace is equipped with a combustion air proving switch that ensures a safe and efficient operation by monitoring the combustion air flow. Additionally, the unit has a condensate trap that collects and drains condensation, preventing potential water damage. The furnace also includes a blower motor control that regulates the airflow, optimizing heating performance.