| Business | Phone |
| Marstan Inc 11421 Yellow Pine St Nw, Minneapolis 55448 | (612) 377-3471 |
| Custom Duct 6804 W Lake St, Minneapolis 55426 | (952) 926-0330 |
| Excel Fabricating Inc 2301 Nevada Ave N, Minneapolis 55427 | (763) 531-3952 |
| Fabricated Duct Systems 7625 Boone Ave N, Minneapolis 55428 | (763) 595-4322 |
| General Sheet Metal 1301 2nd Ave S, Minneapolis 55403 | (612) 343-0682 |
| Kaufman Sheet Metal 2521 24th Ave S, Minneapolis 55406 | (612) 722-0965 |
| W & D Sheet Metal Inc 2648 37th Ave S, Minneapolis 55406 | (612) 729-0589 |