6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 2-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] Compatible with Duct 3" With its fully removable feature accordion content RFG2525 Black-HP 18" Round Duct Pipe

With its fully removable feature and safety hook

+ Product Details Size – Stick-on collar is 14" and it is compatible with duct 14"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 10" OR 10" X 16" duct opening (measured at the opening)

+ Product Details Size – 20"w X 4"h is the size for the duct opening measurement only

+ Product Details Durable Construction – Made from galvanized steel for long-lasting use and strength in HVAC applications

6" x 6" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 2 Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 9" x 9"] Compatible with Duct 3" With its fully removable feature accordion content RFG2525 Black HP 18" Round Duct Pipe With its fully removable feature and safety hook + Product Details Size – Stick on collar is 14" and it is compatible with duct 14"