The mains powered detectors are inter-connectable, making them suitable for residential and light commercial environments. The difference between the KF10 (Ionisation) and the KF20 (Optical) is that the ionisation smoke alarm detects the smoke in the immediate atmosphere through the chemicals produced by the fire and the optical alarm "see's" the smoke within the atmosphere, both triggering the fire alarm warning. In addition the new KF20 also comes complete with a dust compensation and bug screen reducing the inconvenience of nuisance alarms. Dust Protection In-built foam gasket in rear of alarm to prevent dust ingress into rear of the alarm

The Kidde KF Firex range have superseded the Firex 4000 series, the Kidde 9HI and 9HILLS can be interconnected with the KF range. CE tested and certified Sensor Optical, circular lateral chamber with insect-resistant width slot entry portals and added bug screen mesh The updated Kidde Firex KF10 and KF10R alarms are mains powered, interlinking ionisation smoke alarms that use up to 70% less energy than previous Firex models. The units are hard wired and can be interlinked with other units from the series to create all round fire protection within the home.Optional Controls Wired Remote Test and Hush Unit (REMTH) allows test and hush of interlinked units

Optical smoke detection is much less susceptible to false alarms from everyday fumes such as cooking vapours and natural humidity. This makes them ideal for installation in hallways, bedrooms, landings and living areas, including those rooms adjacent to kitchens, but not within them.The table below shows the Kidde smoke alarms which can be replaced by the KF20 optical smoke alarm when they reach the end of their 10 year lifespan. Product Code Please note – That when replacing an existing Kidde fixture, all parts / accessories will need to be bought as new e.g. new alarm / new base plate **