10" x 10" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 3-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 13" x 13"] 3-Way or 4-Way this 30-gauge stick-on collar is RGADJ-3012 7" Round Duct Pipe Quality Packaging carefully packaged

this 30-gauge stick-on collar is specifically sized at 20 inches

+ Product Details Size - 32"w X 14"h X 2"d (for duct opening measurement only)

Crafted from sturdy aluminum and gypsum sheetrock

the actual front end outer dimensions are 10" in diameter

10" x 10" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 3 Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 13" x 13"] 3 Way or 4 Way this 30 gauge stick on collar is RGADJ 3012 7" Round Duct Pipe Quality Packaging carefully packaged this 30 gauge stick on collar is specifically sized at 20 inches + Product Details Size 32"w X 14"h X 2"d (for duct opening measurement only)