18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 19.75"w x 19.75"h] Compatible with Duct 10" rust-free aluminum construction with smooth 14" Round Duct Pipe For 10 duct opening FR M 414 White

rust-free aluminum construction with smooth finished edges and counter-sunk screw holes (screws included)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening)

[Outer Dimensions: 10

actual front end outer dimensions are approximately 22 5/8" width X 12 5/8" height -

18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Brown [Outer Dimensions 19.75"w x 19.75"h] Compatible with Duct 10" rust free aluminum construction with smooth 14" Round Duct Pipe For 10 duct opening FR M 414 White rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included) + Product Details Perfect Fit & Easy Sizing Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening)