8"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 23.75"h] Grilles + Product Details Perfect Fit accordion content RFG2525 Black-HP 18" Round Duct Pipe

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening)

75" Width X 26

Gymnasiums & Restaurants

actual front end outer dimensions are approximately 27 5/8" width X 36 5/8" height

+ Product Details Size – 24"w X 28"h is the size for the duct opening measurement only

8"w X 22"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 9.75"w x 23.75"h] Grilles + Product Details Perfect Fit accordion content RFG2525 Black HP 18" Round Duct Pipe + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 24" OR 24" x 20" duct opening (measured at the opening) 75" Width X 26