HVAC Duct Start Collar Take Off | 12" Sheet Metal Snap Together Start Collar is Compatible with 12" Duct Color_Red Oak The total outer size of Suitable for all AC 8in diameter 12125SDCLNGBX

The total outer size of this grille is the listed size plus 1

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 28" OR 28" x 22" duct opening (measured at the opening)

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

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HVAC Duct Start Collar Take Off 12" Sheet Metal Snap Together Start Collar is Compatible with 12" Duct Color_Red Oak The total outer size of Suitable for all AC 8in diameter 12125SDCLNGBX The total outer size of this grille is the listed size plus 1 + Product Details Perfect Fit & Easy Sizing Designed for a 22" x 28" OR 28" x 22" duct opening (measured at the opening)