| Business | Phone |
| Sas Balancing Svc 9744 Sw Tigard St # 100, Portland 97223 | (503) 639-3908 |
| Air Balancing Specialty Inc 3532 Se Milwaukie Ave, Portland 97202 | (503) 230-2332 |
| Professional Air Balance Svc 824 Se 16th Ave # A, Portland 97214 | (503) 232-0668 |
| Neudorfer Engineers Inc 1500 Ne Sandy Blvd # 1, Portland 97232 | (503) 235-8924 |