| Business | Phone |
| Comeau Sheet Metal & Heating 14 Stevens St, Haverhill 1830 | (978) 372-8383 |
| Final Phase Engineering 225 Neck Rd, Haverhill 1835 | (978) 372-4384 |
| Industrial Sheet Metal Co 3 Garden St, Haverhill 1830 | (978) 374-9036 |
| Kenneth Fairbrother & Son Co 16 Stevens St, Haverhill 1830 | (978) 372-5933 |