18"w X 6"h ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - White [Outer Dimensions: 19.75"w X 7.75"h]

18w" x 6h" opening (vent hole) dimension - actual size is approx 2" wider.
You may think of grilles and registers as a generic component of the ventilation system in your house.
But they are also the most visible representation of you air system.
Metal-Fab grilles and registers give you an extra measure of quality that you can point out to your family members and house guests.
Some of our best features aren?t readily apparent, but you?ll appreciate the benefits over a long period of time.
Metal-Fab has a high standard of design, production and finish on all products.
Every part is hand inspected for quality before it is packaged, no exceptions.
No Sharp Surface Edges. Just run your finger along the edge of the top plate and you?ll find a smooth finished surface.
Heavy Gauge Steel. Heavier gauge than needed, built for durability and long life in mind.