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] ceiling including the ability to mount

including the ability to mount without removing the thermostat when using the ring base

Designed with two mounting base options—solid and ring—it offers flexible installation

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

+ Product Details Size – 26"w X 22"h is the size for the duct opening measurement only

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

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] ceiling including the ability to mount+ 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