When the fire alarm is activated, the Wondoors are electrically drawn across the corridor to prevent the spread of the fire to other areas of the building. Each unit has a battery backup in case of a power outage. Panic hardware is provided on each Wondoor unit to allow escape from the building. After allowing passage through the corridor, opening for a programable amount of time, the Wondoor will go back into alarm mode to seal the corricor until the alarm system is reset.

The Wondoor units can also be programmed to close off corridors or balconies to prevent entry into a space (i.e. during evening hours), and can remain closed or be programmed to open when the fire alarm is activated.