16"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 35.75"h] w14h14 Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 35 3/4" x 1"

actual front end outer dimensions are approximately 2" wider

+ Product Details Size – 32" x 34" or 34" x 32" is the size for the duct opening measurement only

+ Product Details Size – 14" x 16" or 16" x 14" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 20 5/8" height

16"w X 34"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 17.75"w x 35.75"h] w14h14 Actual Filter Size – 21+ Product Details Size 16"w X 34"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 17. 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