8" X 16" or 16" x 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 17.75] Side Out Ceiling Register Box + Product Details Size –

+ Product Details Size – 36"w X 12"h is the size for the duct opening measurement only

Applications – Reducers transition ducts from larger to smaller sizes and ensure smooth

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 18" Or 18" x 34" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 32" OR 32" x 30" duct opening (measured at the opening)

8" X 16" or 16" x 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 17.75] Side Out Ceiling Register Box + Product Details Size –+ Product Details Size 8"w X 16"h or 16" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 17. 75" height. High Quality High grade steel construction meant for high foot traffic areas. Installation Location Floor. Design Easy drop in installation. Powder Coat Finish Smooth, shiny, scratch resistant, with no sharp edges. Looks like it was just waxed. Quality Packaging Carefully