Fits 20x12 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 21.75"W X 13.75"H (20" W x 12" H Duct Opening) The Listed size 10"x 3"

The Listed size 10"x 3" is for inside duct opening measurement

compatible with optional dampers for airflow control

Effortless Airflow Control: Our functional floor register is equipped with an easy-to-use airflow control dial

even airflow for improved ventilation and indoor air circulation in residential and commercial spaces

This product has listed size 12“w X 8”h is for duct opening measurement only

Fits 20x12 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 21.75"W X 13.75"H (20" W x 12" H Duct Opening) The Listed size 10"x 3"The Listed size 20"x12" is for inside duct opening measurement, actual outside dimension is 21. 75"x13. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow applications. Screws are included for easy installation White Powder coating with matte finish Individually packed with cardboard box for ultra protection