HVAC Duct Start Collar Take Off | 12" Sheet Metal Snap Together Start Collar is Compatible with 12" Duct Color_Red Oak + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

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

and home improvement & remodeling specialists complete their masterpiece

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

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

HVAC Duct Start Collar Take Off 12" Sheet Metal Snap Together Start Collar is Compatible with 12" Duct Color_Red Oak + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 20"w X 4"h is the size for the duct opening measurement only and home improvement & remodeling specialists complete their masterpiece