Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling Grille Register High Airflow… (18" X 16"

18"w X 16"h Is The Size For The Duct Opening Measurement Only Actual Front End Frame Outer Dimensions Are 19.75"w X 17.75"h - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE High Quality Steel Construction, No Scuff Powder Coat Durable Finish, Smooth, Shiny, Scratch-Resistant, No Sharp Edges, 2 Recessed Screw Holes On Each Side with Screws Included, Screws Same Color As Vent Cover, EASY INSTALLATION LOUVERED Adjustable Register Grille for Sidewall or Ceiling Application, Easy Opening and Closing Back Dampers For Better Airflow Control, Quiet and Smooth Control Lever, Noise Free Components QUALITY PACKAGING - Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment - Hand Inspected for Quality EACH INDIVIDUAL FIN IS ADJUSTABLE FOR MAX AIRFLOW CONTROL – Adjust The Fins To Open or Close From the Front - Easy Unrestricted Air Flow Deflection For Your HVAC System