20" X 16" Return Air Filter Grille * Filter Included * - Removable Face/Door - HVAC VENT DUCT COVER - White [Outer Dimensions: 21.75w X 17.75h]You 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.High StandardEvery part is hand inspected for quality before it is packaged, no exceptions.Quality Packaging - Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In ShipmentEasy Unrestricted Air Flow For Your HVAC System This model has ½? fin design This model can have the face/door removed. This model uses a 1"" thick filter -INCLUDED.How To Measure A GrilleOverall Size: Measure the size of the air duct/drywall opening. Do not measure the overall size of the register itself, only measure the *hole* in the wall/duct. Every grille has a front end frame, that will overlap at wall joint. Total outer size of this grille is; listed size +1.75".Width vs Height The first number in a grille size, represents the width, the second number represents the height. Example: If your hole is 20" wide by 14" tall, order a 20x14. If your hole is 14" wide by 20" tall, order a 14x20.100% Satisfaction Guaranteed Don?t worry, you're covered by our 100% Money Back Guarantee, no questions asked. ClickAdd to Cart now & enjoy a new updated refreshing look of your room.