| # | Company name | Role | # of Projects |
|---|---|---|---|
| 1 | Admiral Ventilation Ltd. | ductwork supplier | 1 |
| 2 | Albina | ductwork supplier | 12 |
| 3 | BGS Erd- und Straßenbau GmbH | ductwork supplier | 1 |
| 4 | FCS Ductwork Ltd. | ductwork supplier | 13 |
| 5 | Gardner & Co. | ductwork supplier | 1 |
| 6 | Hotchkiss Ltd. | ductwork supplier | 9 |
| 7 | Jacteco Mechanical | ductwork supplier | 4 |
| 8 | Onninenlit UAB | ductwork supplier | 0 |
| 9 | Summit Sheet Metal Ltd. | ductwork supplier | 16 |
| 10 | Wavin Baltic UAB | ductwork supplier | 4 |