20"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 27.75"h] Powder-Coated + Product Details Size –

+ Product Details Size – 48"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 20"w X 16"h X 2"d (for duct opening measurement only)

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

+ Product Spec Sheet Round Ceiling Diffuser Spec Sheet

+ Product Details Size – 24" x 26" or 26" x 24" is the size for the duct opening measurement only

20"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 27.75"h] Powder-Coated + Product Details Size –+ Product Details Size 20"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 21. 75" Width X 27. 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