36"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 19.75"h] 14in diameter allow you to customize airflow

allow you to customize airflow direction with ease

Looks like it was just waxed

+ Product Details Size – 4"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 8 5/8" height

Effortless Integration: Crafted for easy connection to supply grilles of drop ceiling T-Bar vent covers

36"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 19.75"h] 14in diameter allow you to customize airflow+ Product Details Size 36"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 37. 75" Width X 19. 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