20"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 9.75"h] w8h8 /* increased padding */ border-radius:

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Its generous size and universal design ensure a perfect fit for a wide range of thermostat models

Actual Filter Size – 25 3/4"w x 35 3/4" x 1"

+ Product Details Size – 8"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 42 5/8" width X 12 5/8" height -

20"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 9.75"h] w8h8 /* increased padding */ border-radius:+ Product Details Size 20"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 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