Good evening to you all! We are finishing up the building of our new home. The builder installed a metal fab chimney system. I’m wanting to use double wall stove pipe with the NC13 I’m getting. But I’m not sure if I need an adapter for the ceiling support box to connect the double wall stove pipe. I can’t find double wall locally and the metal fab website is not helpful addressing the issue. The male end coming off the support box looks just like this. The male end is spot welded in so I know it shouldn’t be removed. Thank you in advance.