22"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 23.75"w x 11.75"h] Color_R-4.2 Yellow Actual Filter Size – 29 7" Round Duct Pipe CRG828 Product Details Size 14

Actual Filter Size – 29 3/4"w x 19 3/4" x 1"

Noise free components - No vibrating louvers etc

+ Product Details Size – 18"w X 28"h is the size for the duct opening measurement only

+ Product Details Operating Temperature From -40°F To +248°F [-40°C To +120°C]

Aluminum Garage Door Air Vent Grille Register - With Damper Control Lever For Winter & Summer Settings - With Insect Net Prevent Guard [17

22"w X 10"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 23.75"w x 11.75"h] Color_R 4.2 Yellow Actual Filter Size – 29 7" Round Duct Pipe CRG828 Product Details Size 14 Actual Filter Size – 29 3 4"w x 19 3 4" x 1" Noise free components No vibrating louvers etc