“…Heat release rate from CDG and OC calorimetries in the FPA was originally defined as the "actual heat release rate" until 1986 [9,[12][13][14][15]; thereafter, however, it was changed to "chemical heat release rate" to account for the effects of (1) the chemical structures of the materials and additives; (2) fire ventilation; (3) the two dominant modes of heat release, that is, convective and radiative; and (4) the effects of flame extinguishing and suppressing agents. The FPA is a standard test apparatus for electrical cables [16,17], for wall and ceiling insulation materials, replacing the 7.6 m (25-ft) corner test (as described in section "Fire Propagation" of this chapter) [18], for clean room materials used in the semiconductor industry [19], and for conveyor belts [20].…”