16"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 31.75"h] Compatible with Duct 8" + Product Details Size - 4" Round Duct Pipe Product Details Size The SHEASC10W1-HP

+ Product Details Size - 36"w X 18"h is the size for the duct opening measurement only

+ Product Details Size – 8"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 11 3/4" x 1"

vibration-free performance

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 24" OR 24" X 14" duct opening (measured at the opening)

16"w X 30"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 17.75"w x 31.75"h] Compatible with Duct 8" + Product Details Size 4" Round Duct Pipe Product Details Size The SHEASC10W1 HP + Product Details Size 36"w X 18"h is the size for the duct opening measurement only + Product Details Size – 8"w X 18"h is the size for the duct opening measurement only