3. Different combustibles feature different smoke emission
rates, which affect the actuation times of smoke detectors.
Test 5, Test 6 and Test 7 feature similar fire source locations
and fire growth patterns in the initial period, making the
actuation times of the sprinklers similar. The actuation time of
the smoke detectors in Test 5 is longer than that in Tests 6 and
7 because the fuel in the latter two scenarios is a sofa, which
features greater smoke emission rates than the wood crib in
Test 5