Fits 24x10 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 25.75"W X 11.75"H (24" W x 10" H Duct Opening) actual outside dimension is 18

actual outside dimension is 18

Simple roundflow design for smooth air flow

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

actual outsize overall dimensions is 12''X12''

Fits 24x10 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 25.75"W X 11.75"H (24" W x 10" H Duct Opening) actual outside dimension is 18The Listed size 24"x10" is for inside duct opening measurement, actual outside dimension is 25. 75"x11. 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