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Kidde 423/9HIR Mains Carbon Monoxide Alarm

Product Code: 4MCO
Brand: Kidde

Coronavirus (COVID-19) Delivery Delays: Please note that due to the current global situation, some orders may be delayed.
RRP: £71.69 ex VAT
£ 66.62 ex VAT or £ 79.94 inc VAT

Estimated delivery: 3 - 6 months

Kidde 423/9HIR Mains Carbon Monoxide Alarm

As the world’s largest manufacturer of domestic fire safety products, Kidde have been safeguarding people and property from fire and related hazards for nearly a century. Their Mains-powered Carbon Monoxide Alarm (423/9HIR) can be interconnected with up to 17 other Kidde or Firex mains alarms, be they smoke, heat, or CO. It also comes with a sealed-in Rechargeable Lithium Battery Backup for seven years of continuous protection in the event of mains failure. This hard-wired CO alarm is ideal for new builds, major refurbishments, or complete re-wiring projects. It can be wall or ceiling mounted by a professionally qualified electrician and complies with UK Building Regulations for new housing and associated standards (BS EN 50292 code of practice).

  • Interconnectable with other Kidde and Firex mains smoke, heat, and CO alarms on a single wiring network using ‘Smart Interconnect’ technology
  • Monitors the air every 15 seconds for the presence of carbon monoxide
  • Tamper-resistant locking device prevents unauthorised removal without the use of a tool
  • End-of-life warning 7 years after initial power up
  • Test/Reset button allows regular testing of alarm function
  • 230V mains-powered with rechargeable lithium cell for 7 years of continuous operation in the event of mains failure
  • Temperature range: 0 to 40ºC
  • Humidity range: 5-95% relative humidity (RH) non-condensing
  • Storage and transport: -20ºC to +60ºC and 5-95% relative humidity (RH) non-condensing
  • Alarm dimensions (mm): 147x147x42
  • Alarm weight: 350g
  • Warranty: 6 years
  • Approvals: BSI certified to EN52091:2001
  • CE tested and certified
  • Product code: 423/9HIR

The lead time on this product is approximately 3 - 6 months.


  • Free delivery on UK Orders over £99.00 ex. VAT
  • Free collection from our Hampton Hill (Middlesex) or Chessington (Surrey) Branches
  • Saver delivery (2-5 working days) - £5.00 ex. VAT

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