Smoke can be vented naturally or mechanically. Natural smoke ventilation uses the inherent buoyancy of hot smoke and airflow dynamics of smoke and air to remove smoke using the building façade. A mechanical system uses powered elements such as fans to force the movement of smoke and allow it to escape through dampers, grills and vents. Mechanical systems generally utilise a smoke shaft and are useful where space is at a premium and/or where natural airflow is insufficient to achieve the required performance.
With Smoke Ventilation
Smoke ventilation allows the creation of a smoke free layer by removing smoke. This improves the conditions for safe escape and permits the fire to be fought in its early stages.
What happens if there is a smoke ventilation system?
1. ln the event of a fire, actuators open high level smoke vents and low level fresh air inlet vents.
2. This allows cool air into the building, forcing the hot air and smoke out via the roof, providing a smoke free layer for safe escape.
3. The smoke free layer allows safe access for the fire to be fought and extinguished.
Without Smoke Ventilation
What happens if there is no means of smoke ventilation?
1. In an unventilated room, smoke will rise directly to the ceiling.
2. The smoke will begin to fill the space available moving laterally instead of vertically.
3. Convection of the smoke will cause it to be drawn back down to low level reducing visibility and the chances of a safe escape.
4. Temperatures will continue to rise causing the potential flash over and collapse of the building.
View our range of AOV/Smoke Vent Actuators here.
View our range of Smoke Control Systems here.
Click here to view our wide range of completed smoke control projects from across the world.
Mechanical Smoke Ventilation: Successfully Keeping the Escape Route Free of Smoke.
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