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What size should cold air return grille be?

9K views 1 reply 2 participants last post by  rakes9720 
#1 ·
I am adding a cold air return in my house in the floor. The ducting will be 8 inch round leading back to the main trunk. How large does the grille need to be in the floor to accomodate this duct and not choke anything down?

Also, is it alright to use a grille that is louvered for the return? Or should I stick with the egg-crate type? Thanks for the assistance!

Nick
 
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