Aluminum Garage Door Air Vent Grille Register - With Damper Control Lever For Winter & Summer Settings - With Insect Net Prevent Guard [Outer Dimensions: 17.5"w X 12"h] Compatible with Duct 8" actual front end outer dimensions

actual front end outer dimensions are approximately 22 5/8" width X 18 5/8" height

Actual Filter Size – 33 3/4"w x 23 3/4" x 1"

+ Product Details Size – 12"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 14"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 16"w X 10"h is the size for the duct opening measurement only

Aluminum Garage Door Air Vent Grille Register - With Damper Control Lever For Winter & Summer Settings - With Insect Net Prevent Guard [Outer Dimensions: 17.5"w X 12"h] Compatible with Duct 8" actual front end outer dimensionsOuter Dimensions Are 17. 5" Wide x 12" Tall x 2. 75" Deep Will Fit All Garrage Doors Insulated And Non Insulated Garrage Doors [The Hole In The Door SHould Be: 15 x 9 ] Made of High Quality Aluminum That Will Never Rust Contorl Lever To Adjust Louvers According To Season Complete Open For Summer To Release The Heat, Close For Winter To Prevent The Cold With Insect Net That Will Prevent Mousquitos and Insects From Entering To Maximize Ventilation