Stairwells - 20% wider than code requires, extra-wide pressurized stairs
Core - three foot {steel} reinforced concrete walls. All of the building's life-safety systems - egress stairs, communication antennae, exhaust and ventilation shafts, electrical risers, standpipes, and elevators - will be encased in a core wall that will be three feet thick in most places.
Emergency
- Lighting - Generator powered and Battery power
- Exits - light and sign system to point the way to safe exit. two stairwell become four at the bottom of building. Additional stair exit locations at all adjacent streets, and direct exits to the street from tower stairs
- Stairwells - total of four stairwells, 2 occupant, 1 emergency stairwell and 1 maintenance
- Sprinklers and Emergency Riser - concrete protection
Smoke Filtration System
Fire Command Stations - two, one in lobby
Internal Repeater System - for emergency radios. In emergency the building becomes an anntenna 1/3 of a mile radius
Air Supply System biological and chemical filters
WTC.com Safety
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