24"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 9.75"h] 18" Round Duct Pipe Actual Filter Size – 25

Actual Filter Size – 25 3/4"w x 31 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 34" OR 34" x 18" duct opening (measured at the opening)

actual front end outer dimensions are approximately 32 5/8" width X 36 5/8" height

+ Product Details Size – 20"w X 28"h is the size for the duct opening measurement only

+ Product Description Introducing HVAC Premium's Aluminum Adjustable Return Grill – the key to enhanced air control and energy efficiency

24"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 9.75"h] 18" Round Duct Pipe Actual Filter Size – 25+ Product Details Size 24"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 75" Width X 9. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never wear