30"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 17.75"h] Fixed Blades Say goodbye to vibrating louvers Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Say goodbye to vibrating louvers - this grille ensures a quiet

+ Product Details Size – 20" x 20" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 26" or 26" x 8" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 26" OR 26" x 24" duct opening (measured at the opening)

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

30"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 31.75"w x 17.75"h] Fixed Blades Say goodbye to vibrating louvers Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Say goodbye to vibrating louvers this grille ensures a quiet + Product Details Size – 20" x 20" is the size for the duct opening measurement only