| Business | Phone |
| Ace Fire & Security 570 Alden Rd, Markham L3R 8N5 | (905) 475-1606 |
| North American Detectors Inc 2600 John St #115, Markham L3R 3W3 | (416) 493-9169 |
| Pyronet Inc 70 Esna Park Dr, Markham L3R 6E7 | (905) 475-2364 |
| Spen-Tech Systems Ltd 3575 14th Ave #1, Markham L3R 0H6 | (905) 474-9277 |
| Carlon Fire Equipment Svc Inc 300 Esna Park Dr, Markham L3R 1H3 | (905) 477-3265 |