12" x 3" Decorative Wood Supply Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction - [Outer Dimensions: 14w X 5"h] Return Grille + Product Details Size –

+ Product Details Size – 18"w X 30"h is the size for the duct opening measurement only

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+ Product Details Size - 25"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 16"h is the size for the duct opening measurement only

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

12" x 3" Decorative Wood Supply Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction - [Outer Dimensions: 14w X 5"h] Return Grille + Product Details Size –12"w X 3"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 14" Width X 5" Height SEE IN DESCRIPTION HOW TO MEASURE A GRILLE Slim Sliding Metal Damper To Control and Adjust Airflow Slots Are Angled to Diversify The Airflow In 2 Way Direction Great for Wall and Floor & ceiling Applications Roundover Beveled Edges Polished Pre Finish Gloss Varnish Ready To Install Can Also Be Sanded And Re finished According To