14"W X 36"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 15.75"W X 37.75"H] 18in diameter Available in both standard and Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Available in both standard and custom sizes

+ Product Details Size – 12" X 4" is the size for the duct opening (floor/vent hole) measurement only

+ Product Details Size – 12"w X 4"h is the size for the duct opening measurement only

Looks like it was just waxed

+ Product Details Size - 24"w X 8"h is the size for the duct opening measurement only

14"W X 36"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 15.75"W X 37.75"H] 18in diameter Available in both standard and Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Available in both standard and custom sizes + Product Details Size – 12" X 4" is the size for the duct opening (floor vent hole) measurement only