16" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover [Outer Dimensions: 18"] w8h8 Its generous size and universal

Its generous size and universal design ensure a perfect fit for a wide range of thermostat models

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actual front end outer dimensions are approximately 27 5/8" width X 18 5/8" height

75"H – fits a 20" X 4" duct opening

16" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover [Outer Dimensions: 18"] w8h8 Its generous size and universal16" Diameter Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 16" Diameter Incorporated with Integral Butterfly Damper for full Airflow Control Assembeled Before Powder Coat Paint, to Ensure Perfect Smooth Finish Commercial Grade Aluminum Will Never Rust Designed for Warehouses, Factories, Workshops, Gymnasiums & Restaurants Center Core is Removable for Easy Access and Maintence 16" Circular Round Aluminum HVAC