18"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 17.75"h] Color_Red Oak actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 16 5/8" height

making it ideal for preventing tampering or unauthorized adjustments

+ Product Details Size - 6" Diameter is the size for the duct opening measurement only

Actual Filter Size – 17 3/4"w x 33 3/4" x 1"

Optimized Comfort: By putting airflow control at your fingertips

18"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 17.75"h] Color_Red Oak actual front end outer dimensions+ Product Details Size 18"w X 16"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 19. 75" Width X 17. 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