4"W X 26"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 5.75"W X 27.75"H] Adjustable Return + Product Details Size - Actual Filter Size 25 AD-S-230-10x10 Width_8in

+ Product Details Size - 12"w X 16"h is the size for the duct opening measurement only

this HVAC vent duct cover ensures durability and reliability

This grille is ideal for both sidewall and ceiling installations

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4"W X 26"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 5.75"W X 27.75"H] Adjustable Return + Product Details Size Actual Filter Size 25 AD S 230 10x10 Width_8in + Product Details Size 12"w X 16"h is the size for the duct opening measurement only this HVAC vent duct cover ensures durability and reliability