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The safe answer is, "you don't" however if you must, you should seek guidance from a structural engineer with a residential construction background.

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10y ago
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Q: How do you cut ceiling joist for ac duct?
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Why do you have exhaust vents in your ceiling?

When you say "exhaust vents in your ceiling" I assume you are referriong to the heating and AC vents inside your house and not the roof vent on the outside used to vent the attic. It is most likely that the duct work was ran in the ceiling for ease of installtion or the house may be built on a slab and they did not want to run the duct work through the slab.


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