10"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 9.75"h] Curved Blade Steel + Product Details Size - Ducting Components RG2016 FBA-HP Applications The C box

+ Product Details Size - 26"w X 10"h is the size for the duct opening measurement only

this air vent diffuser is built to last

with actual outer dimensions of 20

strong aluminum construction with smooth finished edges for easy and safe use

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

10"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 11.75"w x 9.75"h] Curved Blade Steel + Product Details Size Ducting Components RG2016 FBA HP Applications The C box + Product Details Size 26"w X 10"h is the size for the duct opening measurement only this air vent diffuser is built to last