| Business | Phone |
| Air Tech 8300 Tidewater Ct, Knoxville 37923 | (865) 357-6653 |
| Alstom Power 10539 Lexington Dr, Knoxville 37932 | (865) 966-0550 |
| Ambientaire Knoxville 37922 | (865) 966-0750 |
| Atomspheric Glow Tech 924 Corridor Park Blvd, Knoxville 37932 | (865) 777-1726 |
| Sigma Environmental 310 Simmons Rd # Aa, Knoxville 37922 | (865) 675-3600 |