Fits 12x12 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 13.75"W X 13.75"H (12" W x 12" H Duct Opening) The Listed size 10"x 6"

The Listed size 10"x 6" is for inside duct opening measurement

If your duct opening size is 10'' X 10''

actual outsize overall dimensions is 11

this register allows for optimal airflow distribution from your HVAC system

Durable Construction: This air supply register is made of sturdy stamped steel for long-lasting use and reliable performance

Fits 12x12 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 13.75"W X 13.75"H (12" W x 12" H Duct Opening) The Listed size 10"x 6"The Listed size 12"x12" is for inside duct opening measurement, actual outside dimension is 13. 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