At its core, RECD compliance for diesel generators is not proved by attaching a device to an exhaust pipe or keeping a supplier’s brochure on file. It requires a traceable connection between the applicable regulatory direction, the generator’s engine, the selected RECD model, its supporting documents, the completed installation, and continuing maintenance.
RECD stands for Retrofit Emission Control Device. It is installed in the exhaust system of an existing diesel generator to reduce specified pollutants. The technology may involve particulate filtration, catalytic treatment, or a combined configuration, but its regulatory relevance and technical performance must be assessed for the particular generator and location.
Is an RECD Required for Every Diesel Generator?
There should be no blanket assumption that every DG set in India is subject to an identical RECD requirement. The applicable position can depend on the generator’s location, engine capacity, manufacturing date, fuel or technical configuration, intended use, and directions issued by the competent authority. National emission standards for newly manufactured generator engines and retrofit requirements for existing DG sets are also not necessarily the same subject. A product or rule applying to one category should not automatically be extended to another.
Regional requirements can be especially important. In the National Capital Region, for example, DG-set operation has been addressed through directions issued by the Commission for Air Quality Management. State pollution control boards and pollution control committees may also publish notices, consent conditions, or enforcement instructions. The first compliance task is therefore to identify the exact requirement applying to the site. If the position is unclear, the owner should seek current written guidance from the appropriate authority or a qualified environmental professional before purchasing equipment.
Translate the Rule Into a Technical Requirement
Once the applicable direction has been identified, the facility should convert it into a project-specific technical brief. This avoids the common mistake of asking suppliers for “one CPCB-approved RECD” without giving them enough information to assess compatibility. The brief should identify the DG capacity, engine make and model, engine output, manufacturing year, exhaust dimensions, normal operating load, running hours, fuel arrangement, and installation location. It should also include the regulatory document or project specification that prompted the purchase.
This information helps the manufacturer determine whether it has a documented product configuration relevant to the engine. It also allows the buyer to distinguish between a preliminary commercial estimate and a final technical selection. Engine condition must be considered at this point. An RECD should not be used to conceal injector faults, poor combustion, excessive oil consumption, overloading, or inadequate servicing. A mechanically unhealthy generator can produce abnormal soot levels and create avoidable stress on the retrofit system.
Verify the Product, Not Merely the Company
Compliance-related documents should be examined at product level. A manufacturer’s company registration, laboratory association, or quality-management certificate does not necessarily prove the emission performance of the offered RECD. The buyer should request the full certificate, test report, type-approval record, or other applicable evidence behind the seller’s claim. The document should clearly identify the manufacturer, model or product family, tested engine or power category, pollutant scope, test conditions, and relevant limitations.
Annexures are important. A front page may look convincing while the detailed scope excludes the engine category or configuration being quoted. Buyers should also check document dates, revision details, reference numbers, and whether independent verification is possible. The model shown in the technical submission should remain consistent through the purchase order, delivery challan, nameplate, invoice, installation report, and warranty. An unexplained difference between these records should be resolved before commissioning.
Choose the Manufacturer Through Engineering Evidence
Selecting an RECD manufacturer in India should involve more than comparing capacity charts and quoted prices. A capable company should explain why its device suits the actual engine and how it will manage exhaust flow, temperature, soot loading, regeneration, and backpressure. The manufacturer should review the existing silencer, pipe length, bends, stack arrangement, and available maintenance space. It should state whether the system uses passive regeneration, active regeneration, external cleaning, or another maintenance method.
Claims about pollutant reduction must be tied to relevant evidence and test conditions. Performance for particulate matter should not automatically be presented as equivalent control of nitrogen oxides, carbon monoxide, hydrocarbons, or every other exhaust constituent. The proposal should also explain limitations. A supplier willing to identify unsuitable operating conditions is often more credible than one promising identical results for every generator.
Treat Installation as Part of Compliance
A documented RECD can become a non-conforming installation if it is modified carelessly or fitted in a way that differs materially from the accepted configuration. The site survey should examine structural support, thermal expansion, vibration, exhaust leakage, maintenance access, electrical connections, and the route for bringing the equipment into position. Pressure and temperature instruments should be located according to the manufacturer’s design. Backpressure is particularly important because a filter or other treatment component adds resistance to the exhaust system. The RECD, existing silencer, piping, and stack must be considered together. Operators need a clear method for recognising when accumulated soot or another fault has increased pressure beyond the acceptable range.
Installation records should identify the DG, engine, RECD model, and device serial number. Photographs of the nameplate, sensor positions, exhaust connections, and completed arrangement provide useful traceability.
Commissioning Should Create a Baseline
Commissioning should be more meaningful than starting the generator briefly and confirming that exhaust exits the stack. It should establish whether the system has been installed as designed and create baseline observations for future maintenance. The commissioning report can record the generator load, operating duration, visible leakage, instrument status, pressure readings, temperature readings, alarms, and any limitations encountered during the test. The manufacturer should explain how these observations compare with its expected operating range.
Where emission testing is contractually or legally required, the method, testing body, pollutant parameters, and operating conditions should be agreed in advance. A short site test and a laboratory evaluation performed under a defined approval procedure are not interchangeable. The facility team should receive operating instruction before handover. Personnel need to understand the monitoring panel, alarm response, cleaning indications, safe shutdown procedure, and process for contacting the manufacturer.
Build a Compliance File That Remains Useful
The compliance checklist should become a permanent project record rather than a document completed once and forgotten. It should connect the regulatory basis for the installation with the equipment supplied and the way it is operated. A complete file will ordinarily contain the applicable official direction, generator and engine data, manufacturer’s technical proposal, supporting product documents, approved installation drawing, purchase order, invoice, serial-number record, commissioning report, operating manual, warranty, training record, and service contacts.
Maintenance information should be added throughout the RECD’s life. Pressure or temperature logs, filter-cleaning reports, regeneration records, alarm events, replaced components, and technician observations can demonstrate whether the system is being operated responsibly. Digital records should be backed up and labelled consistently. This is particularly important for organisations operating several DG sets, where documents for similar-looking devices can easily be assigned to the wrong engine.
Keep Operational Permission Separate From Product Acceptance
A suitable RECD does not necessarily grant unrestricted permission to operate a DG set. Generator use may remain limited by air-quality measures, emergency-use conditions, consent requirements, fuel rules, or location-specific directions.
Current national information should be checked through the Central Pollution Control Board. Organisations in NCR should also monitor the Commission for Air Quality Management because its directions address regulated DG-set operation across industrial, commercial, residential, and other sectors. A 2024 CAQM publication, for example, referred to implementation of the schedule under Direction No. 76, but users must check for subsequent amendments or replacement directions.
The relevant state pollution control board or pollution control committee should also be consulted. Supplier statements should support product evaluation, not replace current official confirmation.
Frequently Asked Questions
Is an RECD mandatory for every DG set in India?
Not necessarily. Requirements may vary by location, generator category, capacity, configuration, and current regulatory direction.
What proves that an RECD is relevant to a particular generator?
The offered model’s supporting documents should cover the applicable engine or power category, while the manufacturer should provide a site-specific compatibility assessment.
Does RECD installation permit DG operation during every restriction?
No. Separate operating restrictions, GRAP measures, emergency-use conditions, or local directions may continue to apply.
What should be recorded during commissioning?
The report should identify the DG and RECD, document the installation, record relevant operating observations, and establish baseline pressure, temperature, or alarm status where applicable.
How often should compliance documents be reviewed?
They should be reviewed whenever rules change, equipment is modified, a certificate is updated, maintenance reveals a significant issue, or the DG’s operating conditions change.

Conclusion
RECD compliance is best understood as a continuing evidence process. It begins with identifying the correct regulatory requirement, continues through engine-specific product selection and controlled installation, and remains dependent on monitoring, maintenance, and accurate records. Aceget can assist organisations evaluating retrofit emission-control solutions for diesel generators. Before proceeding, buyers should confirm the technical application, verify model-specific documents, preserve commissioning evidence, and review current official directions independently. A strong compliance file is built from consistent facts—not from a sticker, a generic certificate, or a verbal assurance.