Stairwell Pressurization Control System

The high-pressure side of the barrier is either the refuge area or an exit route.

The low-pressure side is exposed to smoke. Airflow from the high-pressure side to the low-pressure side (through construction cracks and gaps around doors) prevents smoke infiltration.

The stairwell pressurization serves several purposes:

• Inhibit migration of smoke to stairwells, areas of refuge, elevator shafts, or similar areas.

• Maintain a tenable environment in areas of refuge and means of egress during the time required for evacuation.

• Facilitate the fire and rescue operation by improving visibility in the building for the firefighting crew.

• Protect life and reduce damage to property.