They are best suited to slow, smouldering fires such as PVC cabling, foam-filled furniture or bedding material.
They are less prone to nuisance alarms than Ionisation alarms from cooking particles and
steam near kitchens.
Both models are mains powered (for professional installation) with rechargeable Lithium cell back-up and full 10-year guarantee.,
Complying with current minimum requirements of the relevant Building Regulations for
new housing, i.e. Grade D (BS5839, Part 6).
Optical Smoke Alarms are for use in escape and circulation routes and in areas where there
is danger of ignition of furniture and surroundings by cigarettes.