Aluminum Perforated Ceiling 1. The sound insulation coefficient reaches 0. 5~0. 82 as 2. Pattern:Variety Aluminum Perforated Ceiling 1. The sound insulation coefficient reaches 0. 5~0. 82 as 2. Pattern:Variety Aluminum Perforated Ceiling False Ceiling, Metal Ceiling, Decorative Ceiling, Suspended Ceiling, Ceiling Panel, Ceiling SystemThe plane square panel and the perforated panel are available. ...