20"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 23.75"h] Return Grille + Product Details Size -

+ Product Details Size - 10"w X 28"h X 2"d (for duct opening measurement only)

For 12" Round Duct Opening - Spiral or Flex

actual front end outer dimensions are 37

offering a smooth

actual front end outer dimensions are approximately 12 5/8" width X 8 5/8" height -

20"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 23.75"h] Return Grille + Product Details Size -+ Product Details Size 20"w X 22"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 23. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never