10"w X 4"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 5.75"H] Ceiling + Product Details Size -

+ Product Details Size - 36"w X 28"h is the size for the duct opening measurement only

40"w X 16"h Is The Size For The Duct Opening Measurement Only

actual front end outer dimensions are approximately 27 5/8" width X 12 5/8" height

Noise free components - no vibrating louvers etc

Actual Filter Size – 23 3/4"w x 17 3/4" x 1"

10"w X 4"h [Duct Opening] 1-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 11.75"W X 5.75"H] Ceiling + Product Details Size -+ Product Details Size 10"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" width X 5. 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