24" X 36" or 36" X 24" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 25.75 X 37.75] 10 Feet Long + Product Details Size - actual front end outer RFG1818 Black Welding & Soldering

+ Product Details Size - 26"w X 12"h X 2"d (for duct opening measurement only)

providing additional safety and protection for your equipment and surroundings

width: 100%

+ Product Details Size & Compatibilty - The 18" to 16" round metal pipe reducer & increaser 30 gauge is compatible with duct 18" to 16"

+ Product Details Size - 16"w X 24"h is the size for the duct opening measurement only

24" X 36" or 36" X 24" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 25.75 X 37.75] 10 Feet Long + Product Details Size actual front end outer RFG1818 Black Welding & Soldering + Product Details Size 26"w X 12"h X 2"d (for duct opening measurement only) providing additional safety and protection for your equipment and surroundings