16"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 37.75"h] Return Grille Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 4" duct openings

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

these louvers are built to last

+ Product Details Size – 10" x 16" or 16" x 10" is the size for the duct opening measurement only

All of these grills have dampers

16"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 37.75"h] Return Grille Ideal for Walls & Ceilings:+ Product Details Size 16"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 75" Width X 37. 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