30"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 7.75"h] 14" Round Duct Pipe actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

actual front end outer dimensions are 3"

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

85" width X 25

actual front end outer dimensions are approximately 36 5/8" width X 22 5/8" height

Actual Filter Size – 24 3/4"w x 9 3/4" x 1"

30"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 31.75"w x 7.75"h] 14" Round Duct Pipe actual front end outer dimensions Compatible With Duct 7in Applications This sheet metal DDAG A 1212 actual front end outer dimensions are 3" + Product Details Size 12"w X 20"h is the size for the duct opening measurement only