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This rubber coupling, listed under the motors category, is a component used in the drive train between an electric motor and a fan. In burners and boilers the fan is driven by a motor, and a coupling of this type transmits torque while compensating for minor shaft misalignment and reducing vibration transmission. Parts of this class typically consist of a flexible rubber element sandwiched between two metal hubs, each keyed or clamped to the respective shaft. When sourcing a replacement, the critical selection parameters are the bore diameters of the two hubs, the overall length, and the torque capacity. The coupling must also match the shaft keyway dimensions and the motor's mounting flange if applicable. A worn or hardened rubber element can cause excessive play, leading to fan imbalance or noise. Inspecting the rubber for cracks, deformation, or separation from the hubs is necessary during service. Because the fan’s speed directly affects the combustion air supply and, in modulating systems, the firing rate, a failed coupling can result in insufficient airflow or erratic burner operation. Always verify that the replacement coupling matches the original physical dimensions and that the rubber material is suitable for the operating temperature range near the fan.