Question

The maximum distance from a door to a fire exit in a residential building in India is:

• A. \(22.5 \text{ m} \)
• B. \(30 \text{ m} \)
• C. \(15 \text{ m} \)
• D. \(25 \text{ m} \)

Hint:

Remember this key life safety metric from the NBC: \[ \text{Max Residential Travel Distance (Standard Construction)} = 22.5\text{ meters} \]

Answer 1

The Correct Option is A

Concept: Life safety requirements in buildings are strictly governed by the National Building Code (NBC) of India, Part 4: Fire and Life Safety. The code defines the travel distance as the maximum distance an occupant must walk from any point inside a room to reach an enclosed fire-rated emergency exit staircase or an open external exit.

Step 1: Reviewing NBC travel distance standards for residential occupancies.
The National Building Code establishes maximum travel distances based on the occupancy classification of the building and its type of construction:
• For Residential Buildings (Group A classification), the maximum allowed travel distance to a safe exit fire enclosure under standard baseline conditions is 22.5 meters.
• This strict layout constraint prevents corridors from becoming too long, ensuring that residents can safely escape in a fire before smoke accumulation compromises visibility or air quality.

Step 2: Contextual variations in travel distance constraints.
To understand the broader context of the code, it is helpful to note how these requirements can vary:
• For other building types, such as commercial or industrial facilities, the allowed travel distance may vary between 30 meters and 45 meters depending on the occupant load and structural risk profile.
• Some code variations allow for longer travel distances if the building is fully protected by an automated, code-compliant fire sprinkler system. However, the standard baseline distance for residential floor plans is 22.5 meters.