36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 37.75"w x 37.75"h] Compatible with Duct 8" and versatile for any project LO246 Product Details Size 32 Compatible with Duct 4"

and versatile for any project

+ Product Details Size – 10" x 32" or 32" x 10" is the size for the duct opening measurement only

+ Product Details Size - 20"w X 20"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 18" OR 18" X 16" duct opening (measured at the opening)

36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh White [Outer Dimensions 37.75"w x 37.75"h] Compatible with Duct 8" and versatile for any project LO246 Product Details Size 32 Compatible with Duct 4" and versatile for any project + Product Details Size – 10" x 32" or 32" x 10" is the size for the duct opening measurement only