28"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 9.75"h] w24h24 + Product Details Size –

+ Product Details Size – 16"w X 24"h is the size for the duct opening measurement only

These are specially sized to fit into all drop ceilings

These grilles and registers give you an extra measure of quality that are visible to your family members and house guests

Actual Filter Size – 11 3/4"w x 27 3/4" x 1"

+ Product Details Size - 12"w X 16"h is the size for the duct opening measurement only

28"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 9.75"h] w24h24 + Product Details Size –+ Product Details Size 28"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 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