S-Series - Roof Mounted Natural Ventilators

The S-Series e-stack ventilation units are designed for rooms which have access to the exterior via the roof and usually with occupancy levels of 30 or more persons. They are ideally suited to halls but can also be used in classrooms. The S-Series unit is square in plan, so hence the name. In winter the system uses a mixing ventilation strategy. Fresh air is brought in through one half of the divided shaft immediately above the S-Series unit, where it is then mixed with hot interior air before being released into the room. Hot polluted air is exhausted from the room through the other half of the divided shaft. By using this e-stack strategy, the heat gains which arise in the room are used for heating the incoming air during the occupied time rather than a radiator which is required in conventional upflow displacement ventilation mode to preheat incoming air at low-level. The heat gains within heavily occupied spaces (e.g. theatres or school halls) are often sufficiently high that additional heating is not needed until the external temperature falls to somewhere in the range 5-10°C, depending on the U-value for the room.