this design can be fixed on glass. Features: 1) Optimized airflow with low noise and high efficient blowing (piping type) 2) Maintenance free motor 3) Metal fan with excellent performance (strong exhaust type) Specifications: 1) Front panel dimensions: a) 150 x 150 b) 180 x 180 c) 208 x 208 2) Opening dimensions: Φ100, 120, 150cm 3) Row tolerance: 130, 240, 320 4) Material: ABS