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The rear grille hr is a replacement component designed for specific boiler models, providing essential protection and ventilation for the rear section of the unit. This grille helps maintain proper airflow around the heat exchanger and other internal parts, which is critical for efficient combustion and safe operation. When servicing or repairing your heating equipment, using the correct rear grille ensures that the boiler remains well-ventilated and protected from debris. A reliable part for boiler maintenance and repair.