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] Aluminum + Product Details Size -

+ Product Details Size - 30"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 28"h is the size for the duct opening measurement only

but you will appreciate the benefits over the period of time

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

Actual Filter Size – 31 3/4"w x 21 3/4" x 1"

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] Aluminum + Product Details Size -10"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