10"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 29.75"h] Return Grille the actual front end outer Suitable for all AC 8in diameter 12125SDCLNGBX

the actual front end outer dimensions are 7" in diameter

+ Product Details Size - 20"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 14 5/8" height -

+ Product Details Size - 22"w X 36"h is the size for the duct opening measurement only

10"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 11.75"w x 29.75"h] Return Grille the actual front end outer Suitable for all AC 8in diameter 12125SDCLNGBX the actual front end outer dimensions are 7" in diameter + Product Details Size 20"w X 18"h is the size for the duct opening measurement only