What type of systems can HVAC systems be classified as provided for smoke management?

HVAC systems used for smoke management can be classified as both positive and negative pressure systems because they serve different purposes in controlling smoke during a fire incident.

Positive pressure systems work by introducing air into a space, which helps to keep smoke from entering that space, effectively creating a barrier that clears paths for safe evacuation and fire containment. In situations where smoke infiltration is a concern, positive pressure can help direct smoke away from occupants and critical areas.

On the other hand, negative pressure systems work by extracting air from a space, which can help remove smoke and contaminated air from the area. This system can effectively lower the pressure in a space to draw smoke out, thereby enhancing visibility and allowing for improved conditions for fire crews to operate.

By understanding both types of systems, personnel responsible for smoke management can effectively implement strategies that utilize the strengths of either or both pressure systems, depending on the specific scenario encountered during fire incidents. This comprehensive approach to smoke management is crucial in ensuring safety and operational efficiency in emergency situations.