20"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 25.75"h] Ceiling Actual Filter Size – 35 Height_16in RG1612AL Product Details Size 14

Actual Filter Size – 35 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 16 5/8" width X 22 5/8" height

+ Product Details Size - 22"w X 18"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are 3"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 8" duct openings

20"w X 24"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 25.75"h] Ceiling Actual Filter Size – 35 Height_16in RG1612AL Product Details Size 14 Actual Filter Size – 35 3 4"w x 33 3 4" x 1" actual front end outer dimensions are approximately 16 5 8" width X 22 5 8" height