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10 Year Longlife Battery Carbon Monoxide Alarm - FireAngel FA3820

4.8 out of 5 stars
Save 8%
£24.67 inc VAT
£20.56 ex VAT
Product Overview

Featuring easy to read LED status indicators, the FireAngel FA3820 carbon monoxide alarm is powered by a 10 year sealed lithium battery and is certified for use in your home or whilst travelling. Unlike other CO alarms, the FA3820 features a pre-alarm warning which encourages ventilation of your property when low levels of carbon monoxide are detected. The combined test / hush button allows for low volume weekly testing, and the Sleep Easy function can silence low battery / end of life warning chirps for up to 8 hours with a single button press.

  • Product Lifespan: 10 years
  • Battery: 10 year sealed lithium battery
  • Warranty: 5 year warranty
  • Designed for wall mounting or free standing installation
  • Certified for the home, caravans, motor homes, and boat use
  • Loud 85dB audible alarm activates when CO level reaches 50ppm
  • 'Pre-alarm' warning encourages ventilation of property when low levels of CO are detected
  • Kitemarked to BS EN 50291-1: 2018 (domestic use) and BS EN 50291-2: 2019 (camping / caravans / boats)
  • CE marked and UKCA marked
  • Low volume test function
    • Single press - self-test at a reduced volume
    • Double press - self-test at full alarm volume
  • Silence low battery / end of life warnings with the Sleep Easy function for up to 8 hours
  • Simple activation with the removal of the disabling tab
  • Indicates previous alarm activation with memory function
  • Dimensions (HxWxD): 67 x 125 x 33mm
  • This alarm is also suitable for both the Welsh and Scottish updated 2022 legislation

Please note: Rawl plugs and screws are not included. Alternative methods for wall mounting are available including self-adhesive pads.

Technical Data
Product Code FAFA3820
Alternative Product Codes FA3820, FA3820-EUX10
Brand FireAngel
Battery Type

10 Year Sealed Lithium


Fire Retardant ABS Plastic

Dimensions (HxWxD)

67 x 125 x 33mm


LED Indicators

Operating Temperature

-10 °C to +40 °C

Relative Humidity

30 to 90% (non-condensing)


50ppm (parts per million) CO gas

Sensor Type

Advanced Electrochemical

Sound Output

85dB(A) at 3 metres (minimum)

Storage Temperature

-20 °C to +50 °C


5 years

Weight 0.10kg
Product Datasheets
FAQs (3)
Q. Where should I install my carbon monoxide alarms?

CO detectors should be installed near potential sources of carbon monoxide, essentially any fuel-burning appliances such as boilers, cookers and ovens, fireplaces (both open and enclosed burners), and portable generators. As you are likely to be most affected by CO in areas of your home that you spend the most time in it is advisable to install alarms in those areas as well, such as the living room and bedrooms. It is also worth noting that while one detector is better than no detectors at all, larger homes may require several detectors to cover the property fully.

Also note that carbon monoxide has been proven to spread into neighbouring properties through open windows and, in semi-detached or terrace houses, through loft spaces. If your property has an attached garage with a connecting door through to the house, it is recommended to fit a CO alarm inside the house leading from that doorway.

Battery powered carbon monoxide alarms can typically be installed wall-mounted or left free-standing on flat, level surface.

  • Near an appliance: they should be placed within 1 to 3 metres horizontally from the appliance and between the height of the appliance to 150mm below the ceiling – i.e., not above a stove where it would be in the path of steam or fumes.
  • In living spaces: they should be positioned close to where the occupant's head is likely to be most of the time – e.g., on your bedside table.

Combined smoke & CO alarms or mains-powered CO alarms are typically installed on the ceiling and should be at least 30cm away from any wall, light fitting, or other obstruction.

Do not install CO alarms within 3 metres of doors or windows, above radiators, or immediately close to anything that gives off steam or fumes like a cooker or shower room. Similarly, it is not recommended to install detectors in dusty areas such as workshops or garages.

For more information, please check the manufacturer's instructions – you can download the PDF manual from the relevant product page on our site. You can also watch our video guide to positioning CO detectors.

Q. What are the symptoms of carbon monoxide poisoning?

The symptoms of CO poisoning can range from mild flu-like symptoms such as headache, drowsiness, confusion, nausea and dizziness to more severe symptoms like breathing difficulties and irregular heartbeat. CO poisoning can ultimately lead to coma and death.

View more symptoms on our carbon monoxide information page.

Q. Where are carbon monoxide alarms required?

Most legislation advises at least one carbon monoxide alarm is fitted near new or replacement fuel-burning appliances that are fixed installations, though rented properties (both social and private sector) often require CO alarms be provided by landlords even if no appliances are being installed or replaced. Examples include boilers, coal fires, wood burners, and gas ovens and cookers, though an exception is often made in legislation for gas appliances solely used for cooking.

However, any and all materials can give off CO when burning, including gas cookers. Carbon monoxide can also spread from neighbouring properties or outside sources such as vehicle fumes. Because of this, Safelincs strongly recommends the installation of carbon monoxide detectors in every home, and also at head-height in bedrooms to protect occupants while sleeping.

Landlords, please see our pages for English, Welsh, and Scottish alarms or our landlord guidance page for more information.

Key Product Features

Single press for a low volume test, double-press for full volume

'Pre-alarm' warning encourages ventilation at low levels of CO

Certified for home, caravans, motor homes, and boat use

Separate Ventilate, CO Alarm, Fault, and Power indicators

What's Included?

Every FireAngel FAFA3820 is supplied with the following components.

  • 1 x FireAngel FA3820 CO alarm
  • 1 x Sealed lithium battery
  • 1 x Screw fixing set (screws & rawl plugs)
  • 1 x Instruction manual

Pricing & Availability

Model Stock Price
Product Code: FAFA3820 Stock Level:
More than 20 in stock Expected dispatch: Today

£24.67 inc VAT

£20.56 ex VAT

Delivery Options

The following delivery options are available on this product.

Standard Delivery

£3.19 inc VAT - Orders will be delivered in 2-3 working days with Evri

Next Working Day Delivery

£6.19 inc VAT - Orders will be delivered the next working day with Evri

For dispatch today order within

Excellent Warranty

This product is supplied with a 5 year manufacturers warranty as standard

Customer Reviews

10 customers have given this product an overall rating of 4.8 out of 5

Reviews by real customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 5 / 5 Stars

Reviewed by: P G

All OK so far Needed a Carbon Monoxide Alarm, found this and all seems good so far, no issues.

Published on: 9th April 2024

Rating: 5 / 5 Stars

Reviewed by: J G

Small clean design good packaging

Published on: 7th April 2024

Rating: 5 / 5 Stars

Reviewed by: G H

Works well and is attractively designed.

Published on: 5th February 2024

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Looking for more information?

If you have any questions or would like more information about this product you can ask one of our specialists.

Direct Telephone 01507 464182


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