36"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 29.75"h] white Actual Filter Size – 27 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Actual Filter Size – 27 3/4"w x 21 3/4" x 1"

75"H – fits a 14" X 12" duct opening

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 20" OR 20" x 30" duct opening (measured at the opening)

actual front end outer dimensions are approximately 34 5/8" width X 28 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening)

36"w X 28"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 29.75"h] white Actual Filter Size – 27 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Actual Filter Size – 27 3 4"w x 21 3 4" x 1" 75"H – fits a 14" X 12" duct opening