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On 24.1, and drilling into the roof...
how did you know how to avoid the air conditioning channels in the roof?
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I did drill though the corner of one channel, it did not seem like a big deal. One reason I used the well nuts is because the roof plywood is not all that thick and I didn't think the screw threads had much to bite into. Also the well nuts are kinda self sealing. I can post a picture of my panel placement if that helps anyone.