1.Adjustable Airflow: Can be rotating the middle panel to adjust the airflow

2.ABS Material: Durable, solid, environment friendly no smells and non-toxic

3.Easy Installation: Available for ceiling mounted or wall mounted

4.Regular size: 4 inch, 6 inch, 8 inch, can support customization.

5.Application: kitchen fans & vents, all home vents, heat transfer and ventilation systems, electric dryers, hood extractors etc