8"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 19.75"h] Compatible With Duct 6in Actual Filter Size – 25

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

Pressure Rating: 2100 to 7000 PSI

+ Product Details Size - 36"w X 36"h X 2"d (for duct opening measurement only)

Insulation density is 30kgs/cbm = 0

8"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 9.75"w x 19.75"h] Compatible With Duct 6in Actual Filter Size – 25+ Product Details Size 8"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 9. 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 wear