12"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 13.75"W X 19.75"H] w28h28 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 30"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 12"h X 2"d (for duct opening measurement only)

For 12" Round Duct Opening - Spiral or Flex

Ensure the fuse or circuit breaker has not tripped

+ Product Details Size – 12"w X 12"h is the size for the duct opening measurement only

12"W X 18"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 13.75"W X 19.75"H] w28h28 + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 30"w X 14"h is the size for the duct opening measurement only + Product Details Size 26"w X 12"h X 2"d (for duct opening measurement only)