14" X 12" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 13.75"H] Aluminum - Cube Core Actual Filter Size – 23

Actual Filter Size – 23 3/4"w x 31 3/4" x 1"

4" X 12" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

Actual Filter Size – 24 3/4"w x 33 3/4" x 1"

these heavy-duty louvers are ideal for use in attics

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14" X 12" [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 15.75"W X 13.75"H] Aluminum - Cube Core Actual Filter Size – 23+ Product Details Size 14"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" width X 13. 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