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· Triple Sealing System: Three layers of sealing effectively block outdoor air, moisture, and noise from entering the interior.

· Flush Sash Design: The inner and outer frames align perfectly when closed, ensuring a tighter seal and superior airtightness.

· Inward-Opening & Tilt Function: Allows for versatile ventilation modes, reducing the chance of rain entering while providing comfortable airflow.

· Interior Opening Glass Sash: The sash opens from the indoor side, eliminating the risk of falling from heights during cleaning or maintenance.

· Removable Screen for Easy Cleaning: The insect screen can be easily disassembled with a one-touch mechanism for convenient cleaning.