MrSteam Commercial 4" × 4" × 2" Alarm For CU Commercial Generators"MAKING STEAM SINCE 1917" The CU Alarm is an audible alarm that sounds in the event that the steam room maximum set temperature is exceeded, or if the CU SteamStop button has been pressed. The CU Alarm may be mounted outside the steam room in a location that will alert an attendant and or user to an over temperature condition. Commercial Steam Room Clients Who Love Mr. Steam Try out a Steam Room Near You You can find MrSteam installed and serving