10" x 6" Decorative Wood Supply Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction - [Outer Dimensions: 12w X 8"h] RV Mobile Home Think of the diameter as

Think of the diameter as a straight line from one end to the other

Actual Filter Size – 33 3/4"w x 7 3/4" x 1"

+ Product Details Size – 12"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 18" x 20" or 20" x 18" is the size for the duct opening measurement only

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10" x 6" Decorative Wood Supply Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction - [Outer Dimensions: 12w X 8"h] RV Mobile Home Think of the diameter as10"w X 6"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 12" Width X 8" 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