| Product Type: | Return Filter Grille |
|---|---|
| Wall Opening (Inches): | 30" x 30" |
| Height (Wall Opening): | 30" |
| Width (Wall Opening): | 30" |
| Color: | White |
| Overall Size: | 31-3/4" x 31-3/4" |
| Material: | Steel |
| Application: | HVAC |
| Series: | 659 |
Yes, the listed size of the air filter grille is the size of the air filter.
Yes, the listed size is the size of the filter. 1" thick.
According to the manufacturer, the installation orientation does not make much of a difference beyond the appearance of the product. There are some small advantages to directing the air in the path of flow in the duct if velocities are high, but that usually isn't necessary. This model does include concealed hinges to change the filter.
Please refer to the following sizing diagram for full details on the dimensions of filter grilles with this style: http://s3.pexsupply.com/manuals/1305642783328/56257_PROD_FILE.pdf