De Dietrich 300027692 fan wheel D133X42

This is a fan wheel, part number De Dietrich 300027692, also listed as 97955491, 97948798, and catalogue article 336.448.001. It belongs to the impellers category and is a rotating component in the fan assembly of a boiler or burner. Parts of this type are fitted to the fan motor shaft and are responsible for moving combustion air through the burner, and in room-sealed appliances, for expelling flue gases. The impeller’s diameter, blade geometry, and orientation determine the airflow and pressure the fan can deliver. When selecting a replacement fan wheel for a burner or boiler, the key parameters are the impeller diameter, the direction of rotation, and the outlet orientation. The air flow and pressure required by the burner or boiler must match the fan wheel’s design. In modulating premix burners, the fan speed is varied by the control system, and the gas valve follows that speed; therefore, the impeller must be in good condition to maintain accurate speed feedback. Typical failures that prompt replacement include worn bearings on the fan motor (though the impeller itself may be undamaged), imbalance caused by dust or debris deposits on the blades, or physical damage during servicing. When replacing the impeller, ensure it is securely locked onto the motor shaft, and check the fan assembly for any runout or vibration after installation. The exact dimensions and hub fitting should be verified against the original part before ordering.