jeff:
Part of the reason for using plants is to avoid this constant air change. 

> Huh...where did you get this from? You could never put enough plants in 
>your bathroom, kitchen etc. to make that work. Sure you can have an 
>outhouse...but many of us are not willing to go that far..especially in 
>winter:)

Yes, i can see that this isn't a useful solution for your
path.  It is for us and has been working for over 7 years.
We don't have any problems with humidity in the bathroom
and the kitchen is problem free.  We don't fry in hot oil
and have a lifestyle that avoids the need for extensive air
changes or filters.

The concept of using plants in closed systems is an old
one and goes back to the early NASA research which occurred
about 30 years ago.  It has come a long way since then and
is now considered fact.  Nothing about this is unusual or
novel.  Nature has been doing it for thousands of years.

>No doubt though that plants can help by putting some oxygen in
>the air, taking up carbon dioxide etc.

The peace lily removes Acetone, Methyl alcohol, benzene,
ammonia, Trichloroethylene, Formaldehyde, and Xylene from the
air.  It may remove other things as well.  It does this all day
long and you don't have to turn it on of off.  For a typical
house it does not take a large number of plants.  If i remember
correctly the guidelines say 4-5 potted plants per room.

I can see this is going into debate mode rather than a
quest for truth, so i'm going on to other topics.

 ----------
Jeff Owens ([EMAIL PROTECTED])  Zone 7
 Underground house, solar energy, reduced consumption, no TV

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