18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 19.75"w x 19.75"h] Color_Black Design – Easy unrestricted airflow

Design – Easy unrestricted airflow for your HVAC system - 50° angled to provide maximum airflow

Actual Filter Size – 7 3/4"w x 17 3/4" x 1"

+ Product Details Size - 14" X 14" is the size for the duct opening measurement only

All of these grills have dampers

+ Product Details Size – 26"w X 8"h is the size for the duct opening measurement only

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