HVAC Premium 10 X 4 1Way AIR Supply Grille Duct Cover Diffuser Flat Stamped FACE

10w X 4h Is The Size For The Duct Opening Measurement Only Actual Front End Frame Outer Dimensions Are 1175w X 575h SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE LOUVERED Supply Grille for Sidewall or Ceiling Application with SmoothGlide Technology Easy Opening and Closing Back Dampers For Better Airflow Control Quiet Lever QUALITY PACKAGING Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment Hand Inspected for Quality Easy Unrestricted Air Flow Deflection For Your HVAC System 12 Inch Spaced Fins.