16" X 16" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 17.75"W X 17.75"H] w25h25 /* more readable bullets */

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

And The Cooler Air From Outside WIll Flow In From The Bottom

+ Product Details Size - 10"w X 34"h is the size for the duct opening measurement only

Horizontal blades in the front

16" X 16" [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 17.75"W X 17.75"H] w25h25 /* more readable bullets */+ Product Details Size 16"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" width X 17. 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