You don't choose a wood box beam; you design one that is built.
What is a wood box beam?
A wood box beam is a hollow beam made from face panels joined together with the ultimate goal of replicating the look of a solid beam. A box beam can have 2, 3, or 4 sides depending upon how and where it will be used (and seen).
This is just a portion of what there is to know about a wood box beam. Learn everything you need to know before pulling the trigger on buying a box beam by reading our all in one top tips on wood box beams here.