22"W X 26"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 23.75"W X 27.75"H] Brown Complies with industry standards of LO246 Product Details Size 32 Compatible with Duct 4"

Complies with industry standards of USA: ASTM D-882

+ Product Details Size - 14"w X 12"h is the size for the duct opening measurement only

+ Product Details Size - 24"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 16" or 16" x 6" is the size for the duct opening measurement only

22"W X 26"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 23.75"W X 27.75"H] Brown Complies with industry standards of LO246 Product Details Size 32 Compatible with Duct 4" Complies with industry standards of USA: ASTM D 882 + Product Details Size 14"w X 12"h is the size for the duct opening measurement only