12" X 18" Or 18" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 19.75] 12-Pack + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 10"w X 26"h X 2"d (for duct opening measurement only)

+ Product Details Size - 24"w X 28"h X 2"d (for duct opening measurement only)

+ Product Details Size – 16"w X 18"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The 8" sheet metal 45-degree oval Flat duct angle is compatible with duct 8"

4" X 14" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

12" X 18" Or 18" X 12" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 13.75 X 19.75] 12 Pack + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 10"w X 26"h X 2"d (for duct opening measurement only) + Product Details Size 24"w X 28"h X 2"d (for duct opening measurement only)