12"w X 4"h 2-Way-Flat Stamped Steel - Vent Cover - Grille Register - Sidewall or Ceiling - High Airflow w8h8 + Product Details Size -

+ Product Details Size - 20"w X 22"h is the size for the duct opening measurement only

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

actual front end outer dimensions are approximately 38 5/8" width X 20 5/8" height -

padding: 14px 14px 6px 46px

12"w X 4"h 2-Way-Flat Stamped Steel - Vent Cover - Grille Register - Sidewall or Ceiling - High Airflow w8h8 + Product Details Size -+ 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