The use of linear Gates is common in various projects. These linear Gates are used in the form of slot Gates which have a unique beauty. To install these Gates, a plenum box is required. In the past, these plenums were made of galvanized material, but with the expansion of the use of Polyurethane sheets made of plenum polyurethane box became common. Due to the defects in the installation of slot valves, Faraz Tahvieh Alborz Company has produced U for slot valves to facilitate the installation of these Gates on the plenum box.