22"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 21.75"h] 3-Way or 4-Way 75"H – fits a 12" Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

75"H – fits a 12" X 10" duct opening

Installing the plaster frame is effortless – secure it into your sheetrock

+ Product Details Size – 28"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 8" or 8" x 6" is the size for the duct opening measurement only

Measure the size of the vent opening

22"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 23.75"w x 21.75"h] 3 Way or 4 Way 75"H – fits a 12" Compatible With Duct 7in Applications This sheet metal DDAG A 1212 75"H – fits a 12" X 10" duct opening Installing the plaster frame is effortless – secure it into your sheetrock