The updated Kidde Firex KF20 and KF20R alarms are mains powered, interlinking optical smoke alarms that use up to 70% less energy than previous Firex models. The KF20 has an alkaline battery back-up and the KF20R, a self-charging lithium battery back-up. The units are hard wired and can be interlinked with other units from the series to create all round fire protection within the home.
Power: Mains powered with battery backup
Backup Battery: 9V alkaline or self-charging longlife lithium backup options
Warranty: 6 year warranty
Up to 70% less energy consumption compared to previous Firex models
A maximum of 24 units can be interlinked via signal cable
Suitable for installations complying to BS 5839-6: 2019 Grade D1 (KF20R) or Grade D2 (KF20)
Test / Hush button
Low battery warning chirp - can be silenced for 8 hours
Supplied with dust cover (to protect unit temporarily if you carry out dusty work)
Supplied with fixings; 2 x screws and 2 x rawl plugs
Please Note: The Kidde Firex KF20 (previously Kidde 4973 / KF2) and KF20R (previously Kidde 4985 / KF2R) are replacements for the Kidde 2239HI and 2239HILLs and can still be interlinked, however the new models cannot be used on the same base plates and use different connector blocks.