| Business | Phone |
| Mechanical Contractors Assn 857 May St N, Thunder Bay P7C 3S2 | (807) 622-9121 |
| Micron Mechanical Ltd 174 Powley St, Thunder Bay P7A 2K7 | (807) 344-0091 |
| Babcock & Wilcox 556 Squier Pl, Thunder Bay P7B 6M2 | (807) 767-4966 |
| Venshore Mechanical Ltd 1019 Northern Ave, Thunder Bay P7C 5L6 | (807) 623-6414 |
| Boreal Mechanical Contractors 891 Alloy Pl, Thunder Bay P7B 6G4 | (807) 345-1312 |
| Ekt 90 Inc 600 Norah Cres, Thunder Bay P7C 5V8 | (807) 623-5211 |
| Clow Darling Ltd 1201 Cameron St, Thunder Bay P7C 5Y7 | (807) 623-7485 |
| E S Fox Ltd 905 Commerce St, Thunder Bay P7E 6E8 | (807) 475-4281 |