hi.
my nose suggests to me that the fumes are coming in via the ventilation system.
i know you had a co alarm for me, and it never got installed, but with the headache-inducing fumes down here, i need to insist.
and, it has been the law for a few years.
"17. Do all existing residential buildings require CO alarms?
Existing residential occupancies that contain at least one
fuel-burning appliance (e.g., gas water heater or gas furnace),
fireplace or an attached garage, require the installation of a CO
alarm.
[Div. B, 2.16.1.1.(1)]"
http://www.mcscs.jus.gov.on.ca/english/FireMarshal/CarbonMonoxideAlarms/QuestionsandAnswers/OFM_COAlarms_QandA.html
the thing is that the co alarm is probably also a methane alarm. and if it's not, i'm going to need to find a way to test the air down here.
j