Which equipment is used to remove smoke from a structure?

The PPV fan, or Positive Pressure Ventilation fan, is utilized to clear smoke from a structure by creating a pressure difference that forces smoke out through designated exits. This equipment is vital in firefighting operations, as it helps to improve visibility and air quality, allowing firefighters to navigate more effectively and reduce the risk of smoke inhalation for both occupants and responders.

In contrast to other choices, while an exhaust fan can help in ventilating smoke under specific conditions, its primary function is generally more about air circulation rather than actively expelling smoke. A smoke ejector may be more focused on drawing smoke out but doesn't operate on the same principle of creating positive pressure as the PPV fan. The ventilation hood typically assists in directing smoke and fumes from localized sources like kitchens rather than addressing broader structural smoke issues in emergency situations.