Fire theory, rules and regulations

Fire Classification of Divisions

Class B Fire Division
  • Class B fire divisions must be of non-combustible materials and must prevent the propagation of flames for at least 30 minutes during a standard fire test.
  • The divisions must be insulated so that the average temperature on the unexposed side of the division does not exceed 140 ºC above the initial temperature.
  • Furthermore, the temperature at any single point on the unexposed side must not exceed 225 ºC above the initial temperature within the time limits.
Class A Fire Division
  • Class A fire division must be of non-combustible materials and insulation materials must be fire tested at a recognised institution. They must be sufficiently braced and must prevent the propagation of flames and smoke for a minimum of one hour during a standard fire test.
  • The divisions must be insulated so that the average temperature on the unexposed side of the division does not exceed 140 ºC above the initial temperature.
  • Furthermore, the temperature at any single point on the unexposed side must not exceed 180 ºC above the initial temperature within the time limits.
Class H Fire Divisions
  • Class H fire divisions must be of non-combustible materials and insulation materials must be fire tested at a recognized institution. They must be sufficiently braced and must prevent the propagation of flames and smoke for a minimum of two hours during a standard fire test for a hydrocarbon fire.
  • The divisions must be insulated so that the average temperature on the unexposed side of the division does not exceed 140 ºC above the initial temperature.
  • Furthermore, the temperature at any single point on the unexposed side must not exceed 180 ºC above the initial temperature within the time limits.