| 1 | Bharat Heavy Electricals Ltd (BHEL) | Hyderabad |
| 2 | Wesman Thermal Engineering Processes Pvt Ltd | Kolkata |
| 3 | SGN Air System | Hyderabad |
| 4 | R D Pollution Control Pvt Ltd | Hyderabad |
| 5 | Global Enviro Air Systems | Hyderabad |
| 6 | Perfectum Industries | Secunderabad |
| 7 | Qucon Pressure Parts Pvt Ltd | Hyderabad |
| 8 | M/s. S.R. Fabricators | Hyderabad |
| 9 | Shanti Boilers and Pressure Vessels Pvt Ltd | Hyderabad |
| 10 | M/s. Nirmal Industries | Hyderabad |
| 11 | M/s. Hi Tech Engineering Works | Hyderabad |
| 12 | M/s. India Enviro Projects / India Infra Projects | Hyderabad |
| 13 | M/s. Sidhaartha Agnecies | Secunderabad |
| 14 | M/s Almonard Pvt Ltd | Mumbai |
| 15 | Fitch Metals Engineering India Pvt. Ltd | Mumbai |
| 16 | Shree Udyog | Mumbai |
| 17 | Blow Tech Engineers | Mumbai |
| 18 | Laxmi Engineering Works | Mumbai |
| 19 | Fibro Techniks | Mumbai |
| 20 | Shree Ram Industrial Air Systems | Mumbai |
| 21 | Standard Air Control | Mumbai |
| 22 | Unimax Pollution Control India Pvt Ltd. | Mumbai |
| 23 | Thermo Set Poly Products Pvt Ltd. | Navi Mumbai |
| 24 | D.M. Engineering | Mumbai |
| 25 | Empire Engineering Corporation | Mumbai |
| 26 | Maa Tara Engineering Works | Mumbai |
| 27 | Yagnam Pulverizer Pvt. Ltd. | Navi Mumbai |
| 28 | M/s Universal Engineering | Mumbai |
| 29 | Concept Engineering Systems | Thane |
| 30 | Coroseal Chemical Equipments Pvt Ltd. | Navi Mumbai |
| 31 | Alpha Projects | Mumbai |
| 32 | Polyplast Chemiplants (I) Pvt Ltd | Thane |
| 33 | Universal Engineering | Mumbai |
| 34 | Bajaj Steel Industries Ltd | Nagpur |
| 35 | M.P. Engineering Co | Ahmedabad |
| 36 | Gatipraday Engineers | Ahmedabad |
| 37 | Laxmi Project | Umbergaon |
| 38 | Ricon Engineering Pvt. Ltd | Ahmedabad |
| 39 | Shree Deep Enterprises | Vadodara |
| 40 | Heatchem Engineering | Ahmedabad |
| 41 | Ambica Electricals | Ahmedabad |
| 42 | M/s Mittal Fabricators | Ahmedabad |
| 43 | M/s Precious Fab Cast Pvt Ltd. | Ahmedabad |
| 44 | Precimax Industries | Ahmedabad |
| 45 | AB Industries | Ahmedabad |
| 46 | J B Brothers | Ahmedabad |
| 47 | M/s. System & Solutions | Ahmedabad |
| 48 | Pioneer Furnaces Pvt Ltd | Anand |
| 49 | M/s Aditya Enterprises | Valsad |
| 50 | Chaminda Industries | Vadodara |
| 51 | Jyoti Fiberglass | Vapi |
| 52 | Shree Brahmani Industries | Vadodara |
| 53 | United Engineering Company | Vadodara |
| 54 | Prajapati Fibre Glass | Valsad |
| 55 | Axtel Industries Limited | Halol |
| 56 | Haass Hydraulic Engineers | Alwar |
| 57 | Airex Engineers | Ahmedabad |
| 58 | NU Fibrotech | Ankaleshwar |
| 59 | Shree Vahanvati Engineering Works | Mehsana |
| 60 | ENGI-CON | Pune |
| 61 | Aerotek Pollucontrol Pvt Ltd | Pune |
| 62 | Raj Process Equipments | Pune |
| 63 | M/S Sangola Fan Engineering Co Ltd | Pune |
| 64 | Yansons Engineering Pvt Ltd | Pune |
| 65 | ZEN Electric Co. | Pune |
| 66 | Ionisation Filtration Industries Pvt Ltd | Pune |
| 67 | Precicut Engineers Pvt. Ltd | Aurangabad |
| 68 | Swami Vessels Pvt Ltd | Jalgaon |
| 69 | V-Tech Enterprise | Karad |
| 70 | M/s Excellent Airtech | Pune |
| 71 | M/s Projects and System Engineers | Pune |
| 72 | HI Tech Boilers | Kolhapur |
| 73 | A.C. Humidification | New Delhi |
| 74 | C.D. Blower Systems | New Delhi |
| 75 | J.K. Enterprise | Ghaziabad |
| 76 | Agni Boilers Pvt Ltd | Ghaziabad |
| 77 | Ensol Power Pvt. Ltd | Ghaziabad |
| 78 | Eros Consultant | Ludhiana |
| 79 | Steam Tech Engineering Company | Amritsar |
| 80 | Swam Pneumatics Pvt Ltd | Noida |
| 81 | Spray Technics | New Delhi |
| 82 | M/s Evangel India | Faridabad |
| 83 | Himenviro Environmental Technologies Pvt Ltd | New Delhi |
| 84 | Ganesh Mechanical Works | Punjab |
| 85 | Precision Engineering Works | Kolkata |
| 86 | Alfa Enterprises | West Bengal |
| 87 | Welltech Environmental Engineering Pvt. Ltd. | Kolkata |
| 88 | M/S. Enviro-Treat Engineers Pvt Ltd | Kolkata |
| 89 | Karnataka Engg. Enterprises | Bangalore |
| 90 | Aircon Handling Systems Pvt Ltd | Bangalore |
| 91 | Sasthas Industries | Bangalore |
| 92 | Devaki Reinforced Plastics | Bangalore |
| 93 | Technostat Corporation | Bangalore |
| 94 | Eshan Airflow Systems | Dharwad |
| 95 | Vintech Air Control Engineers | Chennai |
| 96 | Vishakan Industries | Salem |
| 97 | Venus Energy Audit System | Coimbatore |
| 98 | Max Equipments Pvt Ltd | Chennai |
| 99 | Axis Thermal Engineering Company | Coimbatore |
| 100 | Southern Magnetics | Coimbatore |
| 101 | Air Wave System | Coimbatore |
| 102 | M/S Kumaran Industries | Bhopal |
| 103 | Bansal Laboratories | Bhopal |
| 104 | B.K. Engineering | Indore |
| 105 | Mech N Tech | Indore |
| 106 | Kataria Industries Pvt Ltd. | Ratlam |
