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Old 09-28-2021, 09:30 PM   #2 (permalink)
freebeard
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Thanks. I've often envisioned a similar box 3x16 feet on my flat roof.

I'd be concerned about airflow through those outer channels. Suppose you offset the holes to the 1/4 and 3/4 points. Essentially, split the difference on the outer fences instead of the central one.

I'm not sure how to equalize the flow (If it's really needed) otherwise.
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