Finished Basement – Cold air return


I have a 750 sq ft finished basement that has 3 6″ round diffusers on the ceiling for the entire area. The basement is completely finished and insulated. I am looking to add a cold air return in the basement and have a 24″ stud cavity that I could use to run one by the floor. Is lower better or should I do it on the ceiling as well.

If I do use the stud cavity and run it down to the floor, how big of a hole and grill should I install?

Thanks for the help.



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