| Business | Phone |
| Sentinel Trending & Diagnostic 1030 Drury Ave Ne #1, Calgary T2E 0M2 | (403) 237-5009 |
| Spectra Fan Svc Ltd 144 Scenic Hill Close Nw, Calgary T3L 1P5 | (403) 239-7478 |
| Design Maintenance Systems 11012 Macleod Trail Se #600, Calgary T2J 6A5 | (403) 278-6169 |