If you are installing this HVAC controller in a furnace built before date code 3294

Enhanced Airflow Control: 3-speed taps allow technicians to optimize performance for heating

ensuring the unit maintains high performance and energy efficiency during the heating season

Part of the Danfoss DML series

AERCO Boiler and Water Heater 59138 Air Filter 322056-301 If you are installing thisThe AERCO Boiler and Water Heater 59138 Air Filter is a high performance 6" K&N replacement air filter engineered to maintain peak efficiency for your commercial heating systems. Designed as a precision fit HVAC induction filter, this component ensures maximum airflow while providing superior washable air filter technology. By effectively trapping particulates, the AERCO 59138 prevents combustion internal debris buildup, protecting sensitive internal