20"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 21.75"w x 21.75"h] Compatible with Duct 8" + Product Details Size - Ducting Components RG2016 FBA-HP Applications The C box

+ Product Details Size - 4"w X 34"h is the size for the duct opening measurement only

these louvers are built to last

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 24" OR 24" X 16" duct opening (measured at the opening)

75"H – fits a 12" X 10" duct opening

justify-content: center

20"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Black [Outer Dimensions 21.75"w x 21.75"h] Compatible with Duct 8" + Product Details Size Ducting Components RG2016 FBA HP Applications The C box + Product Details Size 4"w X 34"h is the size for the duct opening measurement only these louvers are built to last