Round Quadrant - Volume Damper | Round Damper Ring | 12" Galvanized Steel Metal Round Duct Ring is Compatible with Duct 12" Height_18in Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 8" duct openings

+ Product Details Size – 10" X 10" is the size for the drywall opening measurement only

+ Product Details Size - 20"w X 10"h X 2"d (for duct opening measurement only)

+ Product Details Size - 12"W X 6"H is (for duct opening measurement only)

Actual Front End Outer Dimensions Are 12" Width X 8" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

Round Quadrant - Volume Damper | Round Damper Ring | 12" Galvanized Steel Metal Round Duct Ring is Compatible with Duct 12" Height_18in Ideal for Walls & Ceilings:+ Product Details Size & Compatibility The 12" round quadrant volume damper is compatible with duct 12" Superior Quality Made in the USA. Our manual adjuster damper quadrant is made of high quality galvanized sheet metal with crimped ends (snap lock design) for easy fitting and secure connection Applications This circular volume control damper plate is used to stops or regulates the flow of air inside a duct, chimney, vav box, air handler, or other