EBM PAPST Tangential fan QL3/3000A2-2118LH-455cx 55443.12001

The EBM PAPST QL3/3000A2-2118LH-455cx is a tangential fan designed for combustion air supply in burners and boilers. It operates at a rated voltage of 12 V, consumes 0.8 A, and has an input power of 10 W. The fan delivers an air flow of 80 m³/h and has overall dimensions of 302.6x18 mm, with a length of 380 mm and width of 302.6 mm. This model is identified by SKU 55443.12001 and article number 377.145.075.

When selecting a replacement tangential fan of this type, ensure the voltage and control mode (mains on/off, PWM, or 0-10 V signal) match the burner control board. Verify the air flow and static pressure requirements, as well as the direction and orientation of the air outlet. The flange pattern and mounting arrangement must be compatible with the existing housing. Measure the impeller diameter and overall dimensions to confirm fit.

Common failure modes for tangential fans include worn bearings causing noise or seizing, imbalance from deposits on impeller blades, and speed feedback errors that the boiler interprets as an airflow fault, leading to lockout. In single-phase motors, a failed capacitor can also cause failure. Check for unusual noises, vibration, or error codes related to airflow.