28"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 13.75"h] 18" Diameter Say goodbye to vibrating louvers

Say goodbye to vibrating louvers - this grille ensures a quiet

+ Product Description Upgrade your HVAC system with our 4" Round Air Vent Supply Grille

Actual Filter Size – 7 3/4"w x 35 3/4" x 1"

40"w X 16"h Is The Size For The Duct Opening Measurement Only

28"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 13.75"h] 18" Diameter Say goodbye to vibrating louvers+ Product Details Size 28"w X 12"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 13. 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