Hi Bob, Dehumidifier bars *alone* won't do it, as the RH will rise in the booth as moisture comes out of the wood. There has to be some way of transferring the moisture from the inside to the outside. This can be achieved with some degree of ventillation in combination with the dehumidifier rods. (In other words, don't have the chamber too air tight.) Fresh, cool air will enter the chamber at some higher RH, and then it will be heated, driving down the RH. The air will then absorb moisture, and the RH will rise. But eventually, the warmer, moist air is vented to the outside (the way the moisture is transferred), and it is replaced by cooler moist air, which can be heated to lower the RH. Put another way, cool air of a given RH has less total moisture than warm air of the same RH. Makes sense??? If you use the heat approach, you'll find some very cheap and effective ceramic heaters at the hardware store (perhaps $15 for 1000W of heat). There's no need to blow lots of money on dehumidifier rods, and the efficiency is exactly the same. A noisier but more effective way to dehumidify is with a running compressor-type dehumidifier, which will condense the moisture out of the air and drain it to the outside. I think you can get one of these things for around $150. I don't know which of these two methods would be more energy efficient. A third way to dehumidify would be with a dessicant in an *air-tight* chamber. (This might be useful for pinblock material, but it gets somewhat impractical on a large scale.) There's a product/company called Drierite, out of Xenia, OH. You can find it on the web. You can buy the stuff fairly economically in 50 lb bags. Drierite draws moisture out of the air and incorporates it into its crystal composition. Depending on the variety you buy, the stuff can have an indicator that changes color when it has soaked up as much moisture as it is able. It looks a bit like blue kitty litter and turns pink with moisture absorption. If I remember correctly, it can absorb about 5 or 10% of its weight in water. When the stuff is "exhausted," you can heat it in an oven to drive off the water, so that you can re-use it. Peace, Sarah
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