It is an interior egress path: using existing vertical shafts or new vertical shafts to accommodate vertical egress path. This would free up further primary egress path space for evacuation and allow better circulation for emergency responders access and egress via fire escape stairs, provide a more efficient evacuation sequence for the entire building. It is intended to be user-friendly, usable by the greatest number of people, regardless of their capabilities, which allow all building occupants an equal opportunity for evacuation.
It is normally built-in at the design stage before the building is constructed and strategically located where occupants can easily and safely gain access to during emergencies:
1. egress path at the smoke free area at the central core building,
2. egress path at any strategic area(s) inside or outside the building,
3. egress path at exterior wall (at perimeter wall)
For old or existing Building, the possible installation sites that can be converted into a precinct (small cubicle room), from the highest floor to the ground floor to safe exit on the same vertical line with no hindrances of piping, wiring, air-con ducts, etc at each level of ceiling floor are:
1. Reserved passage or corridors,
2. Elevator shaft, spare lifts structure, vertical duct,
3. Cubicle toilet, bathroom, laundry room, pantry or storeroom,
4. Vacant space at the core of fire staircase enclosure,
5. Using the exterior wall assembly for extension a rectangular structure out of the building similar to a lift shaft or external fire escape stairs.
It requires a precinct (small cubicle room) with approximate area of 2-sq. m. at each floor of a building. The provision of the precinct from the top storey through the ground level on same vertical line has similarity to a rectangular vertical lift shaft, constructed inside/outside the building to serve every floor. The construction of the precinct has also got the similarity to that construction of fire staircase but without stairs in accordance to country’s fire and building code.
The precinct is constructed with the shortest side of the wall that is of at least 1000mm and the longest side of the wall is of at least 2000mm.