30"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 35.75"h] 6in diameter + Product Details Size - 4" Round Duct Pipe Product Details Size The SHEASC10W1-HP

+ Product Details Size - 32"w X 6"h is the size for the duct opening measurement only

Designed to seamlessly integrate with T-Bar vent covers in drop ceiling setups

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 36" OR 36" x 26" duct opening (measured at the opening)

provides a modern look and quiet operation due to its half-inch by half-inch cube design

+ Product Details Size - 18"w X 14"h X 2"d (for duct opening measurement only)

30"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 31.75"w x 35.75"h] 6in diameter + Product Details Size 4" Round Duct Pipe Product Details Size The SHEASC10W1 HP + Product Details Size 32"w X 6"h is the size for the duct opening measurement only Designed to seamlessly integrate with T Bar vent covers in drop ceiling setups