Dirty ductwork, probably a result of infrequent filter changes.
A ceiling made out of dinosaur duct tape!
To hide pipes, wires or duct work.
You can install heating ducts into a suspended ceiling by cutting a hole in the ceiling tiles where the duct will go, attaching the ductwork to the ceiling joists above the suspended ceiling, and sealing any gaps around the duct. Make sure to follow local building codes and consult with a professional if needed to ensure safe and efficient installation.
Make a bulkhead or install a drop ceiling
No Purple and Black CheckeredAccording to the Duck Tape website, there is not purple and black checkered duct tape.
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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.
Paint it, lower the ceiling to cover it, build a 3 sided wooden beam or sheet rock enclosure around it. Use your imagination or that of a contractor.
Check the surrounding areas and the duct itself for anything (dead animal? wet area? mold? ) that could be causing the odor.
To install a kitchen hood vent, first choose a suitable location above the stove. Next, cut a hole in the wall or ceiling for the vent duct. Install the vent hood by securing it to the wall or ceiling. Connect the vent duct to the hood and secure it in place. Finally, test the vent to ensure it is working properly.
The "duct" in an air conditioning and/or heating system is the sheet metal conduit that carries the conditioned air to the perimeter of a structure and back to the HVAC unit. Typically in a residential application it appears as a square or rectangular metal trunk line centrally located on the ceiling of a basement, with round metal run outs coming off the top of the trunk line and running towards the perimeter of the house.
The safe answer is, "you don't" however if you must, you should seek guidance from a structural engineer with a residential construction background.