Terry, Sorry to be long in replying. > How does a "back side installation" differ from a "normal > vertical installation"? I should think heat retention is a factor > in any DC installation, as that is how the dehumidifier works. The back side installation has all the components on the back side of the piano in between various posts. It is for pianos that do not have enough room for installation behind the kneedboard. I've seen these only in catalogs, so I'm not exactly sure about the configuration, but it comes with several small dehumidifier rods. As you say, heat retention is a factor in DC operation--the factor for dehumidification. What I was wondering is how regular plastic compares to the stuff DC sells--specifically, is there any need for heat retention for the back side. I'm glad that the speaker cloth will be available soon for vertical back covers. That would be easier to install than what is currently available, but it would still be cheaper and just as easy to buy a 5x50' roll of plastic and use it to do many pianos for the price of what one DC cover costs. I would like to hear more from Dampp-Chaser about the legality of using only DC products to cover the back side. If it truly is illegal, then I would not do it. John M. Formsma Blue Mountain, MS
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