36"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 9.75"h] Material_Steel + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 20" OR 20" X 14" duct opening (measured at the opening)

actual front end outer dimensions are approximately 24 5/8" width X 18 5/8" height

Insulation density is 30kgs/cbm = 0

+ Product Details Size - 26"w X 14"h is the size for the duct opening measurement only

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

36"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 9.75"h] Material_Steel + Product Details Perfect Fit+ Product Details Size 36"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 9. 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 wear