MrSteam 7" x 10" x 4" Timer Digital W / Plate & Vent"MAKING STEAM SINCE 1917" The CU Digital Timer is for use in commercial steam rooms. It includes the Steam Vent to release pressure in the boiler while filling when the timer has timed out. This 30 minute digital timer is easy to use so that patrons can easily time their sessions. Features Easy to use, reliable for safely timing steamroom sessions Timer should only be installed outside the steam room US and Canada UL listed A steam vent is included