The GTAG4R is a 4” (102 mm) rack mounted grommet that can be used in new or existing holes in server racks. The unit is split so that it can be installed very easily around existing cables. The GTAG4R is designed to increase efficiency, minimizing bypass airflow. Overlapping brushes with a secondary EDPM membrane creates an extremely effective air containment system. The unit snaps into place, there is no need to use any fasteners. This makes installation easy, saving on time and labor.