36"w X 16"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 17.75"h] sidewall + Product Details Size -

+ Product Details Size - 36"w X 16"h X 2"d (for duct opening measurement only)

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

+ Product Details Size - 14"w X 6"h Is The Size For The Duct Opening Measurement Only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 24" OR 24" X 16" duct opening (measured at the opening)

Height vs Width: The first number in a floor register size

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