The safe answer is, "you don't" however if you must, you should seek guidance from a structural engineer with a residential construction background.
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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The AC duct's are in multiple places in the home. The main duct would be on the main floor where the air conditioning can keep everything cooler. The duct is located on the floor in the main part of the house.
is AC, bro...
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I am not sure about ac Moore but I know you can get it at walmart
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some AC duct is made of insulation wraped in foil it could be a number of things ei. old duct to rodents
Using a portable AC duct for cooling a room offers benefits such as easy installation, flexibility to move the unit around, and cost-effectiveness compared to traditional AC systems.