10"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 7.75"H] Compatible With Duct 12in + Product Details Size -

+ Product Details Size - 28"w X 14"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 15 3/4" x 1"

This versatile guard features air circulating ports on all four sides to allow proper airflow

+ Product Details Size - 26"w X 32"h X 2"d (for duct opening measurement only)

high-impact clear plastic

10"w X 6"h [Duct Opening] 3-Way Horizontal Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 7.75"H] Compatible With Duct 12in + Product Details Size -+ Product Details Size 10"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 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