| Product Type: | Return Grille |
|---|---|
| Wall Opening (Inches): | 14" x 10" |
| Overall Size: | 15-3/4" x 11-3/4" |
| Height (Wall Opening): | 10" |
| Width (Wall Opening): | 14" |
| Color: | White |
| Material: | Aluminum |
| Application: | HVAC |
| Series: | RH45 |

Hi Eddie, thanks for writing in. This includes the extruded aluminum construction and can be seen in the submittal sheet: https://s3.amazonaws.com/s3.supplyhouse.com/product_files/Hart-Cooley-0F0061-Submittal-Drawing.pdf
No, the louvers on this grille unit are fixed and the airflow is not adjustable.
They are listed width x height. You would need a 30" x 20" in the case you describe.