Safety, Fire & Survival · Fire — Structural Fire Protection Classes
In SOLAS structural fire protection, the difference between an 'A' class and a 'B' class division is that A-class divisions are:
- ASteel (or equivalent), insulated to limit temperature rise and prevent smoke/flame passage for a longer rated period✓ Correct
- BMade of plywood
- CAlways open to the weather
- DUsed only for furniture
Explanation
A-class divisions are steel or equivalent, capable of preventing the passage of flame and smoke for one hour, and insulated so the unexposed side stays below set temperature limits for a rated time (A-60, A-30, A-15, A-0). B-class divisions are non-combustible but to a lesser standard; C-class are merely non-combustible.
Authority: SOLAS II-2; FSS Code
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