3 The requirements of chapter 9 of the Fire Safety
Systems (FSS) Codefootnote, except as modified
by these guidelines, should apply.
4 Where carbon monoxide detectors are used, the
alarm threshold should be set at 40 ppm with the ability of the detector
to be adjusted to high and low sensitivity settings in order to obtain
the optimum performance after considering the fire hazard and the
likely source and to minimise false alarms.