34"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 35.75"W X 19.75"H] 18in diameter + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 14"w X 20"h is the size for the duct opening measurement only

} /* Added styles for hover effect */

Premium Airflow Efficiency - High-performance cube core eggcrate design allows 95% airflow efficiency

+ Product Details Size - 25"w X 24"h is the size for the duct opening measurement only

+ How To Measure A Round Vent Overall Size:

34"W X 18"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 35.75"W X 19.75"H] 18in diameter + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 14"w X 20"h is the size for the duct opening measurement only } * Added styles for hover effect *