"Harry Bloomfield"; "Esq." wrote in
message ...
The Natural Philosopher pretended :
As long as its wet air out and dry air in, the job is done

The air outdoors often reaches 100% humidity, so indiscriminate sucking of
that into a home might not help.

Yes, but its so easy to discriminate.

It is always best to extract the moist air at source to the outdoors.

But that has to be replaced with air from somewhere
so its not necessarily better in that regard.

The main advantage is that the moist air
doesn't get around the rest of the house first.