8"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 13.75"h] 14in diameter and 4-way configurations Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

and 4-way configurations

+ Product Details Size - 36"w X 20"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 33 3/4" x 1"

A: Black Grilles Always Look Sharp And Never Show DIrt & Dust Marks

+ Product Details Size - 10"w X 36"h is the size for the duct opening measurement only

8"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 9.75"w x 13.75"h] 14in diameter and 4 way configurations Compatible With Duct 7in Applications This sheet metal DDAG A 1212 and 4 way configurations + Product Details Size 36"w X 20"h is the size for the duct opening measurement only