Minimum width requirements for hotel emergency exits and evacuation walkways
I am fire safety expert Alexander Li. In hotel fire protection design, the minimum width requirements for safety exits and evacuation walkways are core elements for ensuring safe evacuation of occupants, directly relating to the efficiency of escape and the safety of life and property during a fire. Based on my engineering experience, this issue requires strict adherence to national standards and refined design combined with actual hotel operating scenarios (such as number of guest rooms, occupant density, building height, etc.); otherwise, it may result in insufficient evacuation passages and serious safety hazards.
Detailed Analysis
First, according to Article 5.5.18 of the Code for Fire Protection Design of Buildings (GB50016-2014, 2018 edition), hotels, as public buildings, shall have the minimum width of evacuation walkways and safety exits calculated based on the required net evacuation width per 100 persons, as follows:
- Above-ground floors: When the hotel building height is ≤18 m, the minimum net width of evacuation walkways shall not be less than 1.10 m; when the building height is >18 m, it shall not be less than 1.20 m. The net width of safety exits (such as evacuation doors) shall not be less than 0.90 m, and the total net width of exterior doors on the ground floor shall be calculated based on the floor with the largest number of occupants among that floor and the floors above, but shall not be less than 1.20 m.
- Basement or semi-basement floors: When occupant density is high (such as underground restaurants or conference rooms), the net width of evacuation walkways shall not be less than 1.20 m, and the net width of safety exits shall not be less than 0.90 m.
In addition, Article 5.5.21 specifies the width adjustment coefficients for evacuation walkways: for hotel guest room floors, the required net evacuation width per 100 persons is 0.65 m for floors 1-2, 0.75 m for floors 3 and above, and 0.80 m for high-rise hotels (>32 m). For example, a 10-story hotel (100 persons per floor) shall have a net width of evacuation walkways of at least 0.80 m/100 persons × 100 persons = 0.80 m, but shall still meet the minimum requirement of 1.10 m.
In actual projects, I also need to combine Article 7.4.12 of the Technical Code for Fire Water Supply and Hydrant Systems (GB50974-2014) to ensure that hydrant placement does not affect evacuation width. For example, when hydrant cabinets protrude from the wall, the net width of the evacuation walkway shall be measured from the edge of the cabinet rather than the wall surface. I once participated in a hotel renovation where the original design evacuation walkway width was 1.20 m, but the hydrant cabinet protruded 0.15 m, resulting in an actual net width of only 1.05 m, which did not comply with the code, and was ultimately resolved through recessed installation.
Engineering Case
A coastal resort hotel (12 stories, 120 guest rooms per floor, occupant density calculated at 0.5 persons/㎡) had an initial design evacuation walkway width of 1.10 m. Upon review, it was found that its banquet hall (area 500㎡, expected 400 persons) had evacuation doors only 1.20 m wide, whereas the code requires 1.40 m. We recommended expanding the door opening to 1.50 m, adjusting the walkway to 1.20 m, and optimizing hydrant locations, ultimately passing fire acceptance inspection. This verified the importance of attention to detail.
Summary
The minimum width requirements for hotel safety exits and evacuation walkways shall strictly follow Articles 5.5.18-5.5.21 of GB50016: above-ground floor walkways ≥1.10 m (high-rise ≥1.20 m), safety exit doors ≥0.90 m (crowded places ≥1.40 m), and practical factors such as hydrant protrusion shall be considered. Design should be comprehensively calculated based on building height, number of occupants, and functional areas, avoiding mechanical application of minimum values.
The above are reference opinions. Actual project conditions still need to be further combined with specific working conditions, site conditions, and other factors for comprehensive evaluation and implementation.