24"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 19.75"h] Color_White Insulation – A thick blanket

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

+ Product Spec Sheet Aluminum Return Filter Grille Spec Sheet

Actual Filter Size – 23 3/4"w x 15 3/4" x 1"

actual front end outer dimensions are approximately 34 5/8" width X 14 5/8" height

Filter Size - 19

24"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 19.75"h] Color_White Insulation – A thick blanket+ Product Details Size 24"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 75" Width X 19. 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