36"W X 25"H (Duct Opening) Return Air Steel Vent Grille - HVAC Vent Duct Cover Diffuser - (Outer Dimensions: 37.75"W X 26.75"H) Height_16in + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 14"w X 8"h Is The Size For The Duct Opening Measurement Only

reducing electric bills and extending HVAC machine lifespan

Actual Filter Size – 15 3/4"w x 24 3/4" x 1"

+ Product Details Size - 14"w X 14"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size - 14"w X 34"h X 2"d (for duct opening measurement only)

36"W X 25"H (Duct Opening) Return Air Steel Vent Grille HVAC Vent Duct Cover Diffuser (Outer Dimensions: 37.75"W X 26.75"H) Height_16in + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 14"w X 8"h Is The Size For The Duct Opening Measurement Only reducing electric bills and extending HVAC machine lifespan