12"w X 8"h Is The Size For The Duct Opening Measurement Only Actual Front End Frame Outer Dimensions Are 13.75"w X 9.75"h - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE
12 x 8 is the Overall Size: MEASURE the size of the DUCT OPENING. Do not measure the old vent cover. If your duct opening is 12" wide by 8" tall, order a 12x8
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 - 1/2 Inch Spaced Fins