D/C covers

[Roger Wheelock]

Hello Fred,

Moisture buildup occurs over a prolonged period of time as we oscillate our
test room between 20% RH to 70% RH, holding it at each extreme for several
days.  The vertical back cover is installed so that one corner is unsecured.
This allows adequate ventillation.  We actually tested a back cover with
approximate 1 inch holes in it.  It did not perform as well as the current
design.

Roger Wheelock
Dampp-Chaser

> For purposes of humidity control, I'd think you would actually want to
> hinder movement of moisture (equivalent of trapping it part of the
> time), and if a DC system was installed, you might be able to assume
> that whatever moisture "built up" would be wicked through from
> underneath (a dangerous assumption maybe, but then, how much moisture
> would build up? From what source? Maybe you can tell I live in a dry
> climate here).
> Which makes me wonder about the vertical back cover system in
> conjunction with the DC system installed in the back of certain pianos.
> Am I wrong in remembering the back cover was developed originally just
> for this application? Why doesn't moisture build up in this scenario (or
> does it)?
> Fred Sturm
> University of New Mexico
>