16" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover [Outer Dimensions: 18"] flat stamped steel High Quality – Solid rigid

High Quality – Solid rigid steel body for durability and reliability with dampers operable by switch for airflow directional control

+ Product Details Size - 4"w X 16"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 20 5/8" height

Actual Front End Outer Dimensions Are 10" Diameter

Great emphasis has been invested in the design of this product to prevent it from kinking in sharp bends & turns and to hold steady and at full diameter in all applications

16" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover [Outer Dimensions: 18"] flat stamped steel High Quality – Solid rigid16" 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