26"W X 32"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 27.75"W X 33.75"H] 18" Round Duct Pipe + Product Details Size - MFFG410-1 w6h6 actual front end outer

+ Product Details Size - 24"w X 30"h is the size for the duct opening measurement only

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

+ Product Details Size - 26"w X 8"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 8"h is the size for the duct opening measurement only

26"W X 32"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 27.75"W X 33.75"H] 18" Round Duct Pipe + Product Details Size MFFG410 1 w6h6 actual front end outer + Product Details Size 24"w X 30"h is the size for the duct opening measurement only + Product Description Maximize the efficiency of your ventilation system with our top of the line HVAC grilles and registers