16"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 15.75"h] w18h18 + Product Details Size -

+ Product Details Size - 6"w X 12"h is the size for the duct opening measurement only

For 10" Round Duct Opening - Spiral or Flex

+ Product Details Size - 20"w X 8"h is the size for the duct opening measurement only

this solid-base guard ensures long-lasting performance with minimal hassle

Actual Filter Size – 47 3/4"w x 23 3/4" x 1"

16"w X 14"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 15.75"h] w18h18 + Product Details Size -+ Product Details Size 16"w X 14"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 75" Width X 15. 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