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25w X 25h Steel Return Air grilles - Sidewall and cieling - HVAc DUcT cOVER - White25w X 25h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 26.75 Width X w X 26.75 Height - SEE BELOW IN DEScRIPTION HOW TO MEASURE A gRILLEYou may think of grilles and registers as a generic component of the ventilation system in your house. But they are also the most visible representation of you air system. These grilles and registers give you an extra measure of quality that are visible to your family members and house guests. Some of the best features arent readily apparent, but you will appreciate the benefits over the period of time. This grille has a high standard of design, production and finish on all products. Every part is hand inspected for quality before it is packaged, no exceptions. No Sharp Surface Edges. Just run your finger along the edge of the top plate and you will find a smooth finished surface. Powder-coat Finish - Smooth, Shiny, Scratch-Resistant, Beautiful. Looks Like It Was Just Waxed Quality Packaging - carefully Shrink Wrapped With cardboard Backing To Prevent Damage In Shipment Easy Unrestricted Air Flow. How To Measure A grille Overall