Fire Damper Actuators

[IAmSparkytus!]

Hello

Working on a site with dampers fitted on the ducting which need fire shut offs connected to the fire panel via an actuator.

The actuators have 4 contacts “Damper Closed NO and NC” and “Damper Open NO and NC”.

Presuming they need a NC contact so the actuator operates and closes the damper when the alarm goes off but not sure which NC contact to utilise.

Any insight appreciated.

Thanks.