3
The CO Alarm is no substitute for keeping
chimneys and flues clear and in good condition,
and all of your appliances serviced regularly
according to the manufacturer’s instructions.
Do not fit alarm until all building work is
completed to avoid contamination.
2. CARBON MONOXIDE - THE SILENT
KILLER
2.1 WHAT IS CARBON MONOXIDE ?
Congratulations on becoming the owner of an Ei
Carbon Monoxide Alarm. This will help protect you
and your household from the dangerous effects of
Carbon Monoxide - The Silent Killer. Many are killed
each year, and many more suffer ill health from
Carbon Monoxide (CO) poisoning (CO is the chemical
symbol, indicating the molecule has one carbon atom
and one oxygen atom). CO is an invisible, odourless,
tasteless and extremely toxic gas. It is produced by
appliances and vehicles burning fuels, such as coal,
oil, natural/bottled gas, paraffin, wood, petrol, diesel,
charcoal etc. CO is absorbed by red blood cells in the
lungs in preference to oxygen - this results in rapid
damage to the heart and brain from oxygen starvation.
High levels of CO in a house can be caused by:
•
Incorrectly or poorly installed fuel-burning
appliances.
•
Blocked or cracked chimneys/flues.
•
Blocked vents or draught-proofing which makes
areas with fuel burning appliances or fireplaces
airtight.
•
Engines of cars, lawnmowers etc. left running in
confined spaces.
•
Portable paraffin or gas heaters in badly ventilated
rooms.
2.2 SYMPTOMS OF CARBON MONOXIDE
POISONING
Most people know that high levels of CO are harmful,
however the period of exposure is also important.
A low level for a long period (e.g. 150 ppm for 90
minutes) can cause the same symptoms (a slight
headache) as a high level of CO for a short period
(e.g. 350 ppm CO for 30 minutes). Table A shows
how exposure to different concentrations of CO
generally affects people.
Many cases of reported Carbon Monoxide poisoning
indicate that while victims are aware they are not
well, they become so disorientated they are unable
to save themselves by either leaving the building or
calling for assistance. Young children and household
pets may be the first affected.
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