By return air not being ducted, I THINK he is referring to the fact tha
you need your return air (the air being pulled from your house into th
furnace) to be sealed off totally from the combustion air (air used fo
combustion). You would accomplish this by ducting the return ai
directly to the furnace, rather than just funneling it into this space
which also contains combustion air. Not sure if that's what yours i
doing or not...
If you are serious, and not pulling my leg or being
inappropriately alarmist, then I think I have not adequately
explained the situation.
There must be 10s of thousands, if not 100s of thousands, of
homes in Southern California which have their furnace in
their garage. I don't think that is contrary to local
building codes or manufacturer's recommendations.
"Return not ducted" may or may not be correct, based on what
I understand, observe, and have written about the situation.
The heated air from the furnace is in fact distributed
through an extensive system of ductwork throughout the
house. Is that the "return" you are talking about?
"Only one combustion air vent" again may or may not be
correct, but the fact that the gas company technician, and
the local building inspectors have all found nothing
hazardous about the installation cause me to believe there
is a second combustion air vent, or that such a second one
is not necessary due to the location inside a garage.
Thank you for your comments