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"<ul>\n<li>16\"w X 20\"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 17.85\" Width X 21.85\"  Height - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE</li>\n<li>Never Rust - High Quality Rigid Aluminum</li>\n<li>Adjustable Louvers - Full Control Horizontal Airflow Direction</li>\n<li>Rigid Design - Noise Free Components - No Vibrating Louvers Etc.</li>\n<li>replacement-furnace-filters</li>\n</ul><b>16\"w X 20\"h Aluminum Adjustable Return/Supply HVAC Air Grille - Full Control Horizontal Airflow Direction - Vent Duct Cover - Wide Front End Overlap - Single Deflection [Outer Dimensions: 17.85\"w X 21.85\"h]</b><br><br>\n\n<b>16\"w X 20\"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 17.85\" Width X 21.85\"  Height - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE</b><br><br><br>\n\n<b>Wide Front End Overlap - 1.65\" Inches.</b><br>\n<b>Never Rust</b> - Our high quality rigid aluminum is the longest lasting filter grille on the market. It will never rust, and will be easy to clean. The rigid Aluminum will keep its shape as in brand new condition.<br>\n<b>Rigid Design</b> - Noise Free Components - No Vibrating Louvers Etc.<br>\n<b>Elegance</b> - Beautifully Structured To Add A Touch Of Upper Class To You Room And HVAC system.<br>\n<b>Powder-Coat Finish</b> - Smooth, Shiny, Scratch-Resistant, Beautiful. Looks Like It Was Just Waxed.<br>\n<b>Quality Packaging</b> - Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment<br>\n<b>Easy Unrestricted Air Flow For Your HVAC System</b><br><br><br>\n\n<b>How To Measure A Grille</b><br>\n<b>Overall Size:</b><br>\nMeasure 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.<br>\nTotal outer size of this grille is; listed size +2.5\".<br><br>\n\n<b>Width vs Height</b><br>\nThe 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."
<https://hvacpremium.com/products/16w-x-20h-aluminum-adjustable-return-supply-hvac-air-grille-full-control-horizontal-airflow-direction-vent-duct-cover-single-deflection-outer-dimensions-1785w-x-2185h>