4" Circular Round Plastic HVAC Supply Grille Air Diffuser -Vent Duct Cover [Outer Dimensions: 6"] 14" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 10 5/8" width X 38 5/8" height

12" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

actual front end outer dimensions are approximately 21 5/8" width X 31 5/8" height

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875" width X 25

4" Circular Round Plastic HVAC Supply Grille Air Diffuser -Vent Duct Cover [Outer Dimensions: 6"] 14" Diameter actual front end outer dimensions+ Product Details Size 4" Diameter is the size for the duct opening measurement only, actual front end outer dimensions are 6" diameter. Design Made of strong durable ABS plastic, will last forever & never rust. Easy removal for cleaning. Airflow Improved airflow dynamics long neck bBody reduced noise design integrated spring fasteners. Easy Installation Just pop the diffuser right into the wall duct hole and the side springs will hold it right into