Kason's 1827 Intelli-Vent Pressure Relief Port is one of four ventilation products within the Intelli-Vent family. The compact design of the 1827 is ideal for small spaces and the telescoping adjustment makes this product a perfect fit for walk-in cooler and freezer walls that are 5" thick or less. Contact us for more information about optional adapter kits for wall thicknesses greater than 5". Since 1926, the Kason® brand has represented dependability and excellence. We proudly manufacture products in the U.S.A. at our Newnan, Georgia headquarters. Kason designs innovative solutions backed by robust quality management to ensure exceptional products. From high-quality hinges, handles and LED lights to vinyl curtains, a broad range of fabrication supplies and more, you can depend on Kason for solutions that help businesses operate more effectively and efficiently. Always demand the best — demand genuine Kason products. Check out all of the products Kason has to offer at http://www.kasonind.com/. It's Better with Kason.