25"W X 32"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 26.75"W X 33.75"H] steel + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 10" duct opening (measured at the opening)

Noise free components - No vibrating louvers etc

+ Product Details Size - 4"w X 24"h is the size for the duct opening measurement only

is fireproof and ensures efficient thermal performance

If you are looking to enhance your project with a top-of-the-line unit

25"W X 32"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 26.75"W X 33.75"H] steel + Product Details Perfect Fit 4 X 12 Is CRFG2028 Width_14in + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 10" duct opening (measured at the opening) Noise free components No vibrating louvers etc