36"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 35.75"h] Outdoor Vent Covers + Product Details Size – MFFG810-1 Product Details Size 20 Compatible with Duct 3"

+ Product Details Size – 28"w X 26"h is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 10" Diameter

Actual Filter Size – 25 3/4"w x 19 3/4" x 1"

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

+ Product Details Size – 12"w X 30"h is the size for the duct opening measurement only

36"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 35.75"h] Outdoor Vent Covers + Product Details Size – MFFG810 1 Product Details Size 20 Compatible with Duct 3" + Product Details Size – 28"w X 26"h is the size for the duct opening measurement only Actual Front End Outer Dimensions Are 10" Diameter