10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 18.5"] Return + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 12" x 24" or 24" x 12" is the size for the duct opening measurement only

6"w X 6"h 3-Way Fixed Curved Blade Air Supply Diffuser - Vent Duct Cover - Grille Register - Sidewall or Cieling - High Airflow - White

actual front end outer dimensions are approximately 10 5/8" width X 26 5/8" height

actual front end outer dimensions are approximately 15

The premium durable material guarantees that they will never rust or wear through

10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 12.5" X 18.5"] Return + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 12" x 24" or 24" x 12" is the size for the duct opening measurement only 6"w X 6"h 3 Way Fixed Curved Blade Air Supply Diffuser Vent Duct Cover Grille Register Sidewall or Cieling High Airflow White