Many vintage homes have large cold air returns in oak that are located in the floor, are flush with the surrounding floor surface, and are usually broken. A wood air return is only strong enough to support a person's weight if it is about 12 inches square or less. Our specially designed eggcrate cold air return is capable of supporting a lot of weight because it has a hefty welded steel support structure and is the perfect solution for this tricky problem. Red oak is standard, other woods available. Call us so we can discuss your situation!