The ModuSec System also includes independently tested options for insulated sprung door 'hatches'. The unit is secured by an electric magnetic lock and set up to open just before a fire suppression gas release - then closing at the correct pressure, to maintain integrity and hold the gas.
A similar unit can be used to allow gas extraction and fresh air entry. This has a motorized opener that can be operated from outside the room.
More traditional overpressure and extract units can also be fitted - with the option of an appropriate security bar set.