We need access to the attic to get the heating installed and run electrical later on. We don't want to have a large opening from the other so I constructed this on yesterday and installed it today. The inner box is 8 inches deep with two layers of rigid Styrofoam on the bottom, two layers of Bat insulation and closed off with two more layers of foam, all sealed, this should be enough. It fits nice and tight and has a low profile. I just have to be careful pushing it up strait so it doesn't jam.
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| An insulated box inside a large frame. |
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| Fits like a glove. |
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| Have to keep the opeing air tight, seal the vapor barrier. |
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| Anohter angle. |
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