| 1 | Durr Universal Inc. | | USA |
| 2 | ArtUSA Noise Control Products | | USA |
| 3 | Industrial Filter Manufacturers Inc. | | USA |
| 4 | Phoenix-E | | USA |
| 5 | Kinetics Noise Control Inc. | | USA |
| 6 | CECO Environmental | | USA |
| 7 | Mueller Environmental Designs Inc. | | USA |
| 8 | Stoddard Silencers of Canada Inc. | | USA |
| 9 | Dynamic Filtration Ltd. | | USA |
| 10 | Aeroacoustic Corp. The | | USA |
| 11 | Noise Barriers LLC | | USA |
| 12 | LoTec Inc. | | USA |
| 13 | Harco Mfg. Co. | | USA |
| 14 | Cuming Microwave Corp. | | USA |
| 15 | O’Neill Engineered Systems Inc. | | USA |
| 16 | Metal Form Manufacturing Co. | | USA |
| 17 | Quietflo | | USA |
| 18 | Walker Electronic Silencing Inc. | | USA |
| 19 | SVI DYNAMICS | | USA |
| 20 | Engineering America Inc. | | USA |
| 21 | Central Air Conditioning & Sheet Metal Inc. | | USA |
| 22 | J.P. Environmental Products Inc | | USA |
