| CIK | Company | State/Country |
|---|---|---|
| 0000002457 | ADVANCE ROSS CORP | MI |
| 0001658880 | BARE METAL STANDARD INC. | FL |
| 0000801128 | BHA GROUP INC | MO |
| 0000318951 | CADEMA CORP | CT |
| 0000949428 | CDTI ADVANCED MATERIALS, INC. | CA |
| 0000003197 | CECO ENVIRONMENTAL CORP | TX |
| 0000778808 | CROWN ANDERSEN INC | GA |
| 0000029644 | DONALDSON Co INC | MN |
| 0001097886 | E/S CORP | WA |
| 0000030985 | EARTH SCIENCES INC | CO |
| 0000863893 | ENVIRONMENTAL ELEMENTS CORP | MD |
| 0000904543 | FAIRFIELD MANUFACTURING CO INC | IN |
| 0001925133 | Filtration Group Corp | IL |
| 0000913953 | FLAIR CORP | FL |
| 0000799526 | FLANDERS CORP | FL |
| 0000846913 | FUEL TECH, INC. | IL |
| 0000043287 | GREAT AMERICAN MANAGEMENT & INVESTMENT INC | IL |
| 0000925006 | IONIC FUEL TECHNOLOGY INC | DE |
| 0001108248 | KRONOS ADVANCED TECHNOLOGIES INC | WV |
| 0000065201 | MET PRO CORP | PA |
| 0000857135 | MIDWESCO FILTER RESOURCES INC /IL | IL |
| 0001872356 | Molekule Group, Inc. | FL |
| 0000801904 | PACIFIC ALLIANCE CORP | UT |
| 0000914122 | Perma-Pipe International Holdings, Inc. | TX |
| 0001010613 | PFEIFFER VACUUM TECHNOLOGY AG | 2M |
| 0000896861 | PLANET TECHNOLOGIES, INC | CT |
| 0000099802 | TRION INC | NC |
| 0000932985 | UNITED AIR SPECIALISTS INC /OH/ | OH |
| 0001385310 | UV FLU TECHNOLOGIES INC | IL |
| 0000842694 | WUHAN GENERAL GROUP (CHINA), INC | A8 |