WSA 304B 0101 - Gap ventilation module for WSC 204/304 61Gap ventilation module suitable Used for smoke control panels type WSC 204 304 61 This module is used for time restricted opening of the comfort ventilation function. It is not always necessary for an electric actuator to open a ventilation unit (window or light dome) by its full stroke. Sometimes, a small gap is sufficient for ventilation purposes. This module enables time controlled limitation of the actuator stroke. The module has no influence on