10"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 19.75"h] Fixed Blades with Damper actual front end outer dimensions

actual front end outer dimensions are approximately 26 5/8" width X 12 5/8" height -

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening)

+ Product Details Size - 6"w X 36"h X 2"d (for duct opening measurement only)

+ Product Description The Clear Plastic Thermostat Guard provides reliable protection and security for your thermostat while ensuring optimal functionality

Adjust the airflow to your preference by simply opening or closing the top panel

10"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 11.75"w x 19.75"h] Fixed Blades with Damper actual front end outer dimensions+ Product Details Size 10"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 11. 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