Re: GBlist: GBList: Re: Dust Mites

Loren Abraham (loren@cstone.net)
Mon, 3 Mar 1997 14:06:54 -0500

Thanks for the explanation surrounding duct leakage, and I agree
that forced air systems should not in any way "Dry out" the air.
I have always wondered , however if is possible that water vapor
escapes from pressurized water and steam heating systems in
significant enough quantities to contribute to the ambient
humidity. Anyone have data to share on this?

Loren

> Loren wrote:
> This (low RH) is even more
> of a problem for homes with forced air heat than for those with
> radiant hot water or steam heat.
> --- end of quoted material ---

Greg wrote:
> It is the duct leakage and air leakage caused by supply and
return pressure
> imbalances that cause increased air change rates in forced air
houses. Two
> buildings could have the same blower door equivalent leakage
areas, but
> different actual leakage rates due to the driving forces of the
HVAC
> equipment, if the ducts leak and/or there are pressure
imbalances. Forced
> air systems don't dry air except through leakage.
>
>
> Greg Thomas
__________________________________________________________________
This greenbuilding dialogue is sponsored by Oikos (www.oikos.com)
and Environmental Building News (www.ebuild.com). For instructions
send e-mail to greenbuilding-request@crest.org.
__________________________________________________________________