12"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 13.75"w x 13.75"h] Color_Black + Product Details Size - RG2230 HP w4h4 const modal document

+ Product Details Size - 12"w X 24"h is the size for the duct opening measurement only

Actual Filter Size – 21 3/4"w x 29 3/4" x 1"

With precise measurements and easy installation

+ Product Details Size – 24"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 30 5/8" height

12"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 13.75"w x 13.75"h] Color_Black + Product Details Size RG2230 HP w4h4 const modal document + Product Details Size 12"w X 24"h is the size for the duct opening measurement only Actual Filter Size – 21 3 4"w x 29 3 4" x 1"