| Business | Phone |
| Air Filco Inc 415 N Tillamook St, Portland 97227 | (503) 282-5170 |
| Airway Supply Co 1015 Se Grant St, Portland 97214 | (503) 233-5566 |
| Cameron Great Lakes 2335 Nw 29th Ave, Portland 97210 | (503) 225-0501 |
| Premium Filter Co Inc 10506 Ne Halsey St, Portland 97220 | (503) 239-3500 |
| Midwest Co / Tdc 4225 Sw Huber St # 325, Portland 97219 | (503) 977-0175 |
| Industrial Air Filter Svc 5240 Sw 49th Dr, Portland 97221 | (503) 452-1545 |