6" X 18" or 18" x 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 19.75] w12h12 The first number in a

The first number in a grille size

3 - Insulation density is 30kgs/cbm = 0

actual front end outer dimensions are approximately 26 5/8" width X 8 5/8" height

Mitsubishi

6" X 18" or 18" x 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 19.75] w12h12 The first number in a+ Product Details Size 6"w X 18"h or 18" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" width X 19. 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