>>concentration of just 10% will cause unconsciousness - remember this when
>
>   Are you confusing this with carbon MONoxide?  Your expired breath
>   typically contains 5% CO2.

In school I learned 7% CO2 is dangerous.
CO is *much* more dangerous, rather poison.

/Morgan
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
\  mrt@iname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /