12"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 27.75"h] Color_Anodized Aluminum + Product Details Size –

+ Product Details Size – 18"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 26" or 26" x 6" is the size for the duct opening measurement only

+ Product Details Size – 24" x 24" with 14" collar T-Bar drop ceiling perforated return grill - metal back casing

Actual Filter Size – 9 3/4"w x 11 3/4" x 1"

+ Product Details Size - 32"w X 22"h is the size for the duct opening measurement only

12"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 27.75"h] Color_Anodized Aluminum + Product Details Size –+ Product Details Size 12"w X 26"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 13. 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