The PBH-350DE Delayed Egress Electromechanical Push Bar is designed for use on emergency exit doors. The built-in electrified lock is designed with its high preload capability that allows smooth operation even under varying loads on the door, such as air-conditioning pressure, changes in the weather, warped doors or doors with weather stripping. It is specially designed for door openings that require delayed egress where you may already have a standard magnetic lock installed.