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] Aluminum Bar + Product Details Size –

+ Product Details Size – 8" x 30" or 30" x 8" is the size for the duct opening measurement only

high-impact plastic to provide reliable and long-lasting protection for your thermostat

+ Product Details Size - 30"w X 18"h is the size for the duct opening measurement only

this 4-way air vent diffuser allows you to precisely control airflow

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] Aluminum Bar + Product Details Size –+ Product Details Size 30"w X 34"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 31. 75" Width X 35. 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