How do I determine the size of my return vent?

Question

I just finished my basement and I now have to put in a return vent in order to pass inspection but I don't know what size return I should use. Also should I split off from the other return?

Thanks in advance!!

Answer 1

Go to a place like Loew's or the Home Depot. They have specialists to whom you can address the question . They might very well have the answer.