18"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 11.75"h] 1-Way + Product Details Size - SV2414 HP Product Details Perfect Fit 12" Round Duct Pipe

+ Product Details Size - 6"w X 28"h X 2"d (for duct opening measurement only)

ready to cut for size of vent pipe

Actual Filter Size – 25 3/4"w x 9 3/4" x 1"

+ Product Details Size – 10"w X 8"h is the size for the duct opening measurement only

+ Product Description Maximize your home’s airflow with this premium 2-way air supply grille

18"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 19.75"w x 11.75"h] 1 Way + Product Details Size SV2414 HP Product Details Perfect Fit 12" Round Duct Pipe + Product Details Size 6"w X 28"h X 2"d (for duct opening measurement only) ready to cut for size of vent pipe