16"W X 12"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 17.75"W X 13.75"H] w30h30 + Product Description Maximize the MFFG410-1 w6h6 actual front end outer

+ Product Description Maximize the efficiency of your ventilation system with our top-of-the-line HVAC grilles and registers

+ Product Details Size - 40"w X 6"h is the size for the duct opening measurement only

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16"W X 12"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 17.75"W X 13.75"H] w30h30 + Product Description Maximize the MFFG410 1 w6h6 actual front end outer + Product Description Maximize the efficiency of your ventilation system with our top of the line HVAC grilles and registers + Product Details Size 40"w X 6"h is the size for the duct opening measurement only