On 20 Dec 2005 12:50:32 -0800, "z" wrote:

Is the fan before or after the heat exchanger? I.e. is the heat
exchanger under positive or negative pressure?
Thanks,
Pondering

I don't think that is a dumb question, and the answers were
interesting.

And remember, there is no such thing as a dumb question. Only a dumb
person.

Remove NOPSAM to email me. Please let
me know if you have posted also.