10"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 29.75"h] Return Grille actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

actual front end outer dimensions are approximately 32 5/8" width X 14 5/8" height -

accordion-content { display: none

the actual front end outer dimensions are 7" in diameter

actual front end outer dimensions are approximately 26 5/8" width X 10 5/8" height -

+ Product Details Size - 20"w X 18"h is the size for the duct opening measurement only

10"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 11.75"w x 29.75"h] Return Grille actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG A 1212 actual front end outer dimensions are approximately 32 5 8" width X 14 5 8" height accordion content { display: none