Redetec with point type detection provides complete detection for the effects of combustion (fire) particles by including two detectors; one detector uses optical technology for larger smoke particle detection, whilst the second uses ionisation detection of smaller smoke particles. Point type smoke detectors are excellent for the detection of smoke in all general applications where airflows rise vertically within the enclosure and airflows are not forced over a rate of 5m/sec. The detectors are used in coincidence to produce a fire signal and initiate extinguishant gas release.