English translation: ceiling grids for air intake and extraction
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ceiling grilles and registers for air outlet and return
Explanation: A grille is a louvered part that covers an opening through which air passes and is usually used for a return air duct. Your may have smaller grilles throughout your home or one large central grille near the furnace.
Registers are grilles that are equipped with a damper for directing and diffusing the airflow into a room. Most registers offer louvered dampers. Clear plastic deflectors give you even more control over air direction.