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2 x Kidde Firex KF20 Smoke Alarm Optical/Photoelectric Mains with 9V Battery Backup

Mains-powered optical (photoelectric) smoke alarm that can be interlinked by cable with up to 23 other Kidde branded mains alarms. Once interlinked, the detection of the relevant danger by an individual unit will sound across all the connected alarms. Back up provided by 9V replaceable battery. Optical alarms are for use in escape or circulation routes and in areas where there is a danger of ignition of furniture and surroundings by cigarettes producing slow, smouldering fires. These alarms comply with UK Building Regulations for new housing and associated standards (Grade D BS 5839, Part 6). Not for use in kitchens, boiler rooms or garages (use KF30 Heat Alarm instead).
  • Interlink with up to 23 Firex branded hard-wired alarms – all alarms sound if danger is detected
  • Alarm memory – identifies source unit within interconnecting network
  • Reduced energy consumption – lower lifetime running costs
  • Combined Test and hush button allows regular testing of alarm function and can be used to temporarily silence nuisance alarms
  • Auto reset after activation
  • Tamper-resistant locking device – prevents unauthorised removal without the use of a tool
  • Mains operation – 9V Alkaline back-up battery supplied as standard
  • Can be utilised to provide a system complying with Grade D of BS 5839, Part 6
  • Sensor Optical, circular lateral chamber with insect-resistant width, 9-slot entry portals
  • Chamber Size 35mm outside diameter x 16mm depth approximate (external)
  • Detection Band Infrared light wavelength
  • Button Test Simulates the effect of smoke within the sensing chamber, checks electronics and sounder
  • Automatic Self-test Circuitry is tested and unit beeps (chirps) if fault is detected
  • Supply Voltage 230V AC, 50 Hz (nominal UK voltage)
  • Power Consumption < 15mA
  • Connection Push-in/snap-fit type connector with 150mm long flying leads (supplied) - see photos
  • Battery Back-up User-replaceable alkaline 9V battery (522/6LR61)
  • Power-on Indicator Continuous green LED
  • Alarm Sounder Electronic piezo-electric sounder (T3 pattern sound - three pulses - space - three pulses) with soldered contacts
  • Sound Output 85dB (A) minimum at 3 metres
  • Alarm Frequency 3.2 kHz typical
  • Dust Protection In-built foam gasket in rear of alarm to prevent dust ingress into rear of the alarm
  • Alarm Status Red LED flashes approx once every five minutes = normal operation
  • Red LED flashes once a second = sensing smoke (sounder alarm sounds)
  • Red LED flashes once every ten seconds = in hush condition (auto-reset after 15 minutes)
  • Interconnection Up to 24 Firex and Kidde ‘Slick’ units (smoke, heat and CO) can be hardwire interconnected
  • with optional control (see below)
  • Optional Controls Wired Remote Test and Hush Unit (REMTH) allows test and hush of interlinked units - sold separately
  • Optional Pattresses SMK23RU also has integral switchable relay for operating remote devices - sold separately
  • SMK4896 – Surface mounting base for added ease of installation - sold separately
  • Fixing Mounting bracket ring supplied with two ‘T’ slot fitting option
  • 57mm spacing to a maximum of 90mm for standard screw fittings on back boxes
  • Bracket has 50mm diameter central access hole for cabling
  • Plastics used NORYL – Cover, main body and mounting bracket
  • Lead-Free Status All Firex alarms are lead-free
  • BSI certified to BS EN14604:2005
  • CE tested and certified
Cabling requirements:-

1.0mm or 1.5mm 6242Y Twin & Earth cable to the first alarm position, then 1.0mm or 1.5mm 6243Y 3 Core & Earth cable from the first alarm position to the second alarm and so on in a "radial" or "daisy chain" type circuit arrangement.

Dimensions: 130mm diameter x 50mm deep

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Monday - Thursday: 7.30am to 4.30pm
Friday : 7.30am - 3pm