8" X 12" Or 12" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 13.75] Powder-Coat Cubic core eggcrate design has

Cubic core eggcrate design has the highest rate of airflow efficiency

Troubleshooting

Actual Filter Size – 17 3/4"w x 21 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 18" OR 18" x 20" duct opening (measured at the opening)

+ Product Details Size & Compatibility – The size of the wall angle register boot is 12" X 6" X 8" and it is compatible with duct 8"

8" X 12" Or 12" X 8" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 9.75 X 13.75] Powder-Coat Cubic core eggcrate design has+ Product Details Size 8"w X 12"h or 12" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" width X 13. 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