16"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 17.75"w x 17.75"h] 14" Round Duct Pipe + Product Details Size – RFGF1212 Rigid Design Noise Free Oval to Round 90-Degree Boot

+ Product Details Size – 24"w X 24"h is the size for the duct opening measurement only

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+ Product Details Size - 25"w X 6"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 14" OR 14" x 26" duct opening (measured at the opening)

our Round Air Vent Supply Grille is the perfect addition

16"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh White [Outer Dimensions 17.75"w x 17.75"h] 14" Round Duct Pipe + Product Details Size – RFGF1212 Rigid Design Noise Free Oval to Round 90 Degree Boot + Product Details Size – 24"w X 24"h is the size for the duct opening measurement only * increased padding * border radius: 6px