Fits 12x8 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 13.75"W X 9.75"H (12" W x 8" H Duct Opening) this register allows for optimal

this register allows for optimal airflow distribution from your HVAC system

If your duct opening size is 10” x 4”

buy a 25x16 grille

The Listed size 14"x 8" is for inside duct opening measurement

The Listed size 24"x20" is for inside duct opening measurement

Fits 12x8 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 13.75"W X 9.75"H (12" W x 8" H Duct Opening) this register allows for optimalThe Listed size 12"x8" is for inside duct opening measurement, actual outside dimension is 13. 75"x9. 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