18" X 6" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 19.75"W X 7.75"H] Color_Red Oak Wood + Product Details Size –

+ Product Details Size – 20"w X 32"h is the size for the duct opening measurement only

Actual Filter Size – 9 3/4"w x 13 3/4" x 1"

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

+ Product Details Size – 18"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 27 5/8" height

18" X 6" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 19.75"W X 7.75"H] Color_Red Oak Wood + Product Details Size –+ Product Details Size 18"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 7. 75" height. High Quality High quality steel with counter sunk screw holes (screws included) and no sharp edges. Equipped with a lever for easy airflow adjustment and dampening. Airflow Control Adjustable airflow lever allows precise control over the direction and volume of air. Installation