12"w X 8"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 9.75"H] Fixed Blades + Product Details Size -

+ Product Details Size - 34"w X 14"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 36 5/8" width X 32 5/8" height

Actual Front End Outer Dimensions Are 42" Width X 18" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

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12"w X 8"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 9.75"H] Fixed Blades + Product Details Size -+ Product Details Size 12"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 9. 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