16"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 15.75"h] white + Product Details Size – LO246 Product Details Size 32 Compatible with Duct 4"

+ Product Details Size – 14" x 14" is the size for the duct opening measurement only

+ Product Details Size – 16" x 28" or 28" x 16" is the size for the duct opening measurement only

Design – 180 degrees double direction adjustable - fins are manually adjustable individually for optimal air distribution

+ Product Details Size - The listed 5" diameter refers specifically to the size of the duct opening

16"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 17.75"w x 15.75"h] white + Product Details Size – LO246 Product Details Size 32 Compatible with Duct 4" + Product Details Size – 14" x 14" is the size for the duct opening measurement only + Product Details Size – 16" x 28" or 28" x 16" is the size for the duct opening measurement only