36"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 21.75"h] Fixed Blades 24"w X 6"h Is The Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

24"w X 6"h Is The Size For The Duct Opening Measurement Only

1/4” - 6518 PSI

actual front end outer dimensions are approximately 36 5/8" width X 10 5/8" height

actual front end outer dimensions are 21

180 Degrees Double Direction Adjustable - Fins Are Manually Adjustable Individually for Optimal Air Distribution

36"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 21.75"h] Fixed Blades 24"w X 6"h Is The Compatible With Duct 7in Applications This sheet metal DDAG A 1212 24"w X 6"h Is The Size For The Duct Opening Measurement Only 1 4” 6518 PSI