20"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 21.75"w x 21.75"h] 8in diameter + Product Details Outer dimensions:

+ Product Details Outer dimensions: 25

Actual Filter Size – 13 3/4"w x 24 3/4" x 1"

actual front end outer dimensions are approximately 28 5/8" width X 16 5/8" height

+ Product Spec Sheet Aluminum Return Filter Grille Spec Sheet

Achieve superior control over your indoor airflow for a more comfortable space

20"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Brown [Outer Dimensions 21.75"w x 21.75"h] 8in diameter + Product Details Outer dimensions:+ Product Details Size 20"w X 20"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 21. 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