16" x 3" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 18w X 5"h] Insulated Line Set accordion-item') 4 X 12 Is CRFG2028 Width_14in

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actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height -

+ Product Details Size - 28"w X 20"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 24" duct opening (measured at the opening)

actual front end outer dimensions are approximately 14 5/8" width X 34 5/8" height

16" x 3" Aluminum Spiral Duct Air Vent Grille Cover Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 18w X 5"h] Insulated Line Set accordion item') 4 X 12 Is CRFG2028 Width_14in accordion item') actual front end outer dimensions are approximately 20 5 8" width X 22 5 8" height