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Use of fire doors in buildings -
• Three fire zones based on demarcation 
Demarcation of buildings : Fire zones
Fire Zone 3Fire Zone 2Fire zone 1
A - Residential
B - Educational
C - Institutional
D - Assembly
E - Small business E1
F - Mercantile 
E - Small business E2-E5
G - Industrial G1-G2
G – Industrial building G3
J – Hazardous building