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Ed,

As much as I would rather buy one from you, I can understand the problem of cost. So, if you are willing to share how you build them, that would be great! After saying that, I would assume there is a market out there for such an item, and not just for Backdrafts. You might put a picture on the site and see what kind of interest you stir up. On the other hand, you may not want to make a bunch of these either. I would love to get some help in building one, unless you have one lying around someplace! If so, consider it sold.

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