6"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 7.75"w x 7.75"h] 8" Round Duct Pipe Actual Filter Size – 27

Actual Filter Size – 27 3/4"w x 29 3/4" x 1"

Actual Filter Size – 29 3/4"w x 5 3/4" x 1"

this grille boasts a sleek frame that ensures a refined and seamless look

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 34" or 34" x 12" duct opening (measured at the opening)

Actual Filter Size – 35 3/4"w x 23 3/4" x 1"

6"w X 6"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - White [Outer Dimensions 7.75"w x 7.75"h] 8" Round Duct Pipe Actual Filter Size – 27+ Product Details Size 6"w X 6"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 7. 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