6"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 37.75"h] 8" Round Duct Pipe Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 17 3/4" x 1"

if your hole is 20" wide by 14" tall

Actual Filter Size – 13 3/4"w x 33 3/4" x 1"

gymnasiums & restaurants

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6"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 7.75"w x 37.75"h] 8" Round Duct Pipe Actual Filter Size – 21+ Product Details Size 6"w X 36"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 7. 75" Width X 37. 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