Round eggcrate grilles with butterfly dampers provide a compact ceiling termination for extract or return air. The durable ABS eggcrate face offers a high open area for quiet airflow, while the manually adjustable butterfly damper allows the air volume to be fine-tuned during commissioning. A spring-clip fixing system supports quick installation into plasterboard ceilings, and the white finish blends neatly with residential and light-commercial interiors.