34"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 35.75"w x 37.75"h] ceiling + Product Details Size - 14" Round Duct Pipe FR M 414 White For 10 duct opening

+ Product Details Size - 12"w X 10"h X 2"d (for duct opening measurement only)

The total outer size of this grille is the listed size plus plus 2 and 5/8"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 22" OR 22" x 32" duct opening (measured at the opening)

+ Product Details Size - 28"w X 6"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 8 5/8" height

34"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 35.75"w x 37.75"h] ceiling + Product Details Size 14" Round Duct Pipe FR M 414 White For 10 duct opening + Product Details Size 12"w X 10"h X 2"d (for duct opening measurement only) The total outer size of this grille is the listed size plus plus 2 and 5 8"