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.
