18" X 24" Or 24" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 25.75] Wall Angle Register Boot + Product Details Size -

+ Product Details Size - 36"W X 4"H is (for duct opening measurement only)

ensure stability and flexibility for precise installation

+ Product Details Size & Compatibility – The 8" galvanized sheet metal straight transitioning duct boot is compatible with duct 8"

For 14" duct opening

If you are looking for perfect-fitting ceiling boxes to enhance your project look no further than HVAC Premium

18" X 24" Or 24" X 18" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 19.75 X 25.75] Wall Angle Register Boot + Product Details Size -+ Product Details Size 18"w X 24"h or 24" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 25. 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