12"w X 4"h 2-Way-Flat Stamped Steel - Vent Cover - Grille Register - Sidewall or Ceiling - High Airflow w8h8 plus { display: inline-block

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Actual Filter Size – 24 3/4"w x 27 3/4" x 1"

+ Product Details Size - 4" Diameter is the size for the duct opening measurement only

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Experience hassle-free installation and full adjustability for optimal airflow

12"w X 4"h 2-Way-Flat Stamped Steel - Vent Cover - Grille Register - Sidewall or Ceiling - High Airflow w8h8 plus { display: inline-block+ Product Details 12"w X 4"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 13. 75" Width X 5. 75" Height Multi Shutter Damper With Handle Operator Screws Included Quality Packaging Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment Easy Unrestricted Air Flow For Your HVAC System + Product Description