Fits 24x14 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 25.75"W X 15.75"H (24" W x 14" H Duct Opening) "outside" measurement is the surface

"outside" measurement is the surface you can see after the installation

Select the listed size that match the duct opening size

buy a 20x14 grille

Individually packed with card board box for ultra protection

Measure the duct opening

Fits 24x14 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 25.75"W X 15.75"H (24" W x 14" H Duct Opening) "outside" measurement is the surfaceThe Listed size 24"x14" is for inside duct opening measurement, actual outside dimension is 25. 75"x15. 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