| Business | Phone |
| Thermal Designs & Mfg 16660 E 13 Mile Rd, Roseville 48066 | (586) 773-5231 |
| Curbs & Damper Products Inc 16525 Eastland St, Roseville 48066 | (586) 776-7890 |
| P-Ess Sheet Metal Fabricators 15300 Common Rd, Roseville 48066 | (586) 771-7950 |
| Industrial Duct Systems Inc 30015 Groesbeck Hwy, Roseville 48066 | (586) 498-3993 |
| Lanzen Fabricating Inc 30980 Groesbeck Hwy, Roseville 48066 | (586) 771-7070 |