20"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 37.75"h] w14h14 + Product Details Size - Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Size - 34"w X 22"h is the size for the duct opening measurement only

Actual Filter Size – 27 3/4"w x 25 3/4" x 1"

+ Product Details Size - 26"w X 22"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 30 5/8" height

20"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 37.75"h] w14h14 + Product Details Size Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Size 34"w X 22"h is the size for the duct opening measurement only Actual Filter Size – 27 3 4"w x 25 3 4" x 1"