18" X 36" Or 36" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 37.75] w30h30 this fitting is perfectly compatible

this fitting is perfectly compatible with 7-inch ducts

+ Product Description Introducing our 14" x 24" or 24" x 14" Floor Grille - a reliable and durable air grill designed for exceptional performance and built to last

Crafted from 600D polyester

+ Product Details Size – 12"w X 10"h is the size for the duct opening measurement only

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

18" X 36" Or 36" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 37.75] w30h30 this fitting is perfectly compatible+ Product Details Size 18"w X 36"h or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 37. 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