14"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 15.75"w x 27.75"h] Fixed Blades with Damper + Product Details Size - Height_14in WD G128 hp jblade overlay

+ Product Details Size - 34"w X 24"h is the size for the duct opening measurement only

+How To Measure A Grille Overall Size:

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

These are built heavy duty for installation into brick and cement walls

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 20" OR 20" x 28" duct opening (measured at the opening)

14"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 15.75"w x 27.75"h] Fixed Blades with Damper + Product Details Size Height_14in WD G128 hp jblade overlay + Product Details Size 34"w X 24"h is the size for the duct opening measurement only +How To Measure A Grille Overall Size: