16" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover [Outer Dimensions: 18"] w16h16 + Product Details Outer dimensions:

+ Product Details Outer dimensions: 19

It has an outer surface made of high-quality aluminum foil and an inner surface made of metalized PET with inside high-tensile spring steel wire

+ Product Description

Design – Heavier gauge than needed

16" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover [Outer Dimensions: 18"] w16h16 + Product Details Outer dimensions:16" 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