Mains Powered Optical Smoke Alarm with Back-Up Battery - Kidde Firex KF20

£23.99 inc VAT
£19.99 ex VAT
Product Overview

The Kidde Firex KF20 and KF20R alarms are a pair of mains powered optical smoke alarms that use up to 70% less energy than their predecessors and are capable of hardwire interlinking with up to 24 other compatible units. The KF20 is fitted with a replaceable alkaline back-up whilst the KF20R is fitted with a rechargeable lithium battery which is designed to last the life of the alarm.

  • 230V mains powered optical smoke alarm
  • Optional alkaline or rechargeable lithium back-up battery versions
  • Up to 70% less energy consumption compared to previous Firex models
  • 6 year warranty
  • A maximum of 24 units can be interlinked via signal cable
  • Kitemarked to BS EN 14604:2005 - view the certificate
  • Suitable for installations complying to BS 5839-6: 2013 Grade D, E and F
  • CE marked
  • LED indicator
  • 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.
Interlink

The table below shows all the units that can interlink with the KF20 and KF20R.

Alarms from the same series
Model Number
Type of unit
Type of interlink
KEKF20
Optical Alarm
Hard wire interlink
KEKF20R
Optical Alarm with Rechargeable Lithium Cell
Hard wire interlink
KEKF30
Heat Alarm
Hard wire interlink
KEKF30R
Heat Alarm with Rechargeable Lithium Cell
Hard wire interlink
KEKF10
Ionisation Alarm
Hard wire interlink
KEKF10R
Ionisation Alarm with Rechargeable Lithium Cell
Hard wire interlink
KEKF2
Optical Alarm
Hard wire interlink
KEKF2R
Optical Alarm with Rechargeable Lithium Cell
Hard wire interlink
KEKF3
Heat Alarm
Hard wire interlink
KEKF3R
Heat Alarm with Rechargeable Lithium Cell
Hard wire interlink
KEKF1
Ionisation Alarm
Hard wire interlink
KEKF1R
Ionisation Alarm with Rechargeable Lithium Cell
Hard wire interlink
Carbon Monoxide Alarms
Model Number
Type of unit
Type of interlink
KE4MCO
CO Detector with Rechargeable Lithium Cell
Hard wire interlink
Compatible Alarms
Model Number
Type of unit
Type of interlink
KE1239HI
Ionisation Alarm with Alkaline Battery
Hard wire interlink
KE1239HILL
Ionisation Alarm with Lithium Battery
Hard wire interlink
KE2239HI
Optical Alarm with Alkaline Battery
Hard wire interlink
KE2239HILL
Optical Alarm with Lithium Battery
Hard wire interlink
KE3239HI
Heat Alarm with Alkaline Battery
Hard wire interlink
KE3239HILL
Heat Alarm with Lithium Battery
Hard wire interlink
I240C
Ionisation Alarm with Alkaline Battery
Hard wire interlink
PADC240
Optical Alarm with Alkaline Battery
Hard wire interlink
KE4973
Optical Alarm with Alkaline Battery
Hard wire interlink
KE4985
Optical Alarm with Lithium Battery
Hard wire interlink
KE4899
Heat Alarm with Alkaline Battery
Hard wire interlink
KE4892
Heat Alarm with Lithium Battery
Hard wire interlink
KE4870
Ionisation Alarm with Alkaline Battery
Hard wire interlink
KE4881
Ionisation Alarm with Lithium Battery
Hard wire interlink
Technical Data

Technical Data

This is the technical data for the Mains Powered Optical Smoke Alarm with Back-Up Battery - Kidde Firex KF20.

Product Code
Kidde KF20 - Alkaline Battery Backup KEKF20-FAP
Kidde KF20R - Rechargeable Lithium Battery Backup KEKF20R-FAP
Weight 0.28kg
Dimensions (HxDia) 39x133mm
Sound Output 85dB (minimum) at 3m
Temperature Range 0° to +40°C
Back-Up Battery KF20: 9V Alkaline
KF20R: Longlife Lithium

Product Datasheets

The following datasheets are available for this product.

Pricing & Availability

Model Stock Price
Kidde KF20 - Alkaline Battery Backup
Product Code: KEKF20-FAP
Stock Level:
More than 20 in stock Expected dispatch: Tomorrow
Price:

£23.99 inc VAT

£19.99 ex VAT

Kidde KF20R - Rechargeable Lithium Battery Backup
Product Code: KEKF20R-FAP
Stock Level:
More than 20 in stock Expected dispatch: Tomorrow
Price:

£39.59 inc VAT

£32.99 ex VAT

Delivery Options

The following delivery options are available on this product.

Economy Delivery

£4.68 inc VAT - Delivered in 2-3 working days by Hermes

Next Working Day Delivery

£7.80 inc VAT - Delivered the next working day by Hermes

For dispatch today order within

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