When selecting the DG set pollution control RECD system for an existing diesel generator, “best” should not simply mean the lowest price or the highest emission-reduction number advertised in a brochure. The better choice is the RECD that matches the engine application, has appropriate certification documentation, can be installed correctly, and can be supported throughout the operating life of the DG set.
The Central Pollution Control Board (CPCB) has established a technical framework for Retrofitted Emission Control Devices used with applicable in-use diesel genset engines up to 800 kW gross mechanical power. The framework addresses particulate-emission control, testing, certification, installation requirements, diagnostics, operator warnings, and related performance considerations. For a facility manager comparing different products in 2026, the right question is therefore not simply “Which RECD is best?” It is “Which certified and technically suitable RECD is best for this particular engine and site?”
What Makes an RECD System a Strong Option?
An effective RECD solution begins with compatibility. The engine manufacturer, exact engine model, gross mechanical power, rated speed, and existing exhaust configuration all matter when evaluating a retrofit. This is particularly important because CPCB's published vendor information is organized according to specific ranges of in-use diesel genset engine power and applicable phases. The official CPCB list dated 9 May 2025, for example, identifies certified manufacturers together with their applicable engine-power ranges and certification agencies.
Consequently, a product advertised for a “500 kVA DG” should not automatically be considered suitable for every 500 kVA generator. Two generators with similar electrical ratings can have different engines and different technical requirements.
A Closer Look at Certification
CPCB's RECD framework establishes a formal approval and testing process. The documentation includes requirements around the functional operation of the device, installation documentation, diagnostic systems, fault codes, operator warnings, and other technical provisions.
One particularly important feature is the requirement for particulate diagnostics and an operator-warning system. The procedure states that fault codes should be registered and that an operator warning should activate when a confirmed fault code is registered. It also specifies requirements for audible warning arrangements and provides for visual warning provisions. This matters in real facilities because an emission-control device should not be treated as invisible equipment. Operators need to know when a system fault could affect its intended operation.
Why the Power Range Matters
The official CPCB RECD procedure applies to applicable in-use diesel-operated internal combustion engines for genset applications up to 800 kW gross mechanical power. A facility should therefore verify the engine's documented mechanical power rather than relying entirely on its generator kVA designation.
For example, a factory may have a 400 kW-class engine while its generator is marketed using an electrical kVA figure. The appropriate RECD should be selected against the relevant engine characteristics and certified application range. This becomes even more important for facilities operating several DG sets from different manufacturers. A single generic RECD specification may not be appropriate for every machine.
Installation Can Separate a Good Product From a Good Project
The equipment itself is only one part of the solution. CPCB's procedure requires RECD manufacturers to provide installation documents containing the technical requirements, including relevant engine hardware, software, and communication provisions needed for correct installation.
At the site, the existing exhaust arrangement must be considered carefully. Space, mounting supports, exhaust routing, sensor positioning, controller location, maintenance access, and back-pressure considerations can affect the practicality of the installation. A product that performs well in testing can still produce problems when the installation is poorly engineered. For that reason, a professional site assessment should ideally happen before the purchase order is finalized.
Monitoring and Diagnostics Deserve Attention
Another useful comparison point is the control and monitoring architecture. Modern RECD systems may incorporate sensors and controllers that monitor operating conditions and communicate faults to the operator. CPCB's published procedure includes particulate diagnostics, non-erasable fault-code registration, operator warnings, and operator-inducement provisions.
For facility managers, this means the controller should be evaluated alongside the physical RECD. Questions about alarms, diagnostics, fault handling, data recording, communication interfaces, and service access can be just as important as questions about the filtration or catalytic hardware. This is especially relevant for industrial sites where generators may operate for long periods during power interruptions or where several generators are monitored from a central control area.
Comparing Products by Emission Performance
Emission reduction is obviously an important selection factor, but published performance figures should be read carefully. CPCB's framework is centered on particulate-matter reduction and includes formal testing and certification procedures. A supplier may publish PM, CO, HC, smoke, or other performance figures, but buyers should establish what was actually tested, under what conditions, and for which engine and RECD combination.
A performance figure from a particular engine configuration should not automatically be treated as a guaranteed result for a different generator. This is why model-specific certification and test documentation are more valuable than a broad marketing percentage.
Maintenance and Reliability Are Part of the Comparison
The best RECD for a facility is not necessarily the one with the most impressive brochure. It may be the one that can be maintained reliably at the actual installation. CPCB's procedure requires manufacturers to provide written operating and maintenance instructions. The documentation also addresses system diagnostics and operator warning functions, demonstrating that continued operation and maintenance are part of the overall design.
Before buying, the facility should understand the expected maintenance process, inspection requirements, service intervals, fault diagnosis, component replacement, and availability of spare parts. A slightly more expensive system with dependable technical support may deliver better long-term value than a cheaper system that is difficult to service.
Choosing the Right RECD Supplier for DG Sets
When evaluating an RECD supplier for DG sets, buyers should look for technical transparency rather than marketing language alone. The supplier should be prepared to identify the proposed RECD model, applicable engine range, certification information, installation requirements, controller configuration, warranty conditions, and maintenance support.
CPCB's supplier documentation itself requires detailed company information and specific RECD model information, including manufacturer or importer details and proposed model names. For an end user, this reinforces an important purchasing principle: the supplier should be able to identify exactly what is being offered and why it is suitable for the particular generator.
When Comparing Aceget and Other RECD Solutions
Aceget's RECD product range covers multiple DG-set capacities and its website presents model-specific information for different generator applications. For buyers considering Aceget alongside other suppliers, the same evaluation framework should be applied: identify the exact model, match it to the engine, review technical and certification documentation, understand the installation scope, and examine after-sales support.
A fair comparison should therefore put technical suitability ahead of brand familiarity. A supplier should not be selected merely because its product has a familiar name or a competitive headline price. For procurement teams, this approach also makes quotations easier to evaluate because every supplier can be assessed against the same engineering and documentation requirements.
What Should Buyers Look for in a “Best” RECD?
A genuinely strong RECD proposal should be supported by documentation that allows the buyer to establish its intended application and certification status. The product should be technically compatible with the engine and capable of being installed without creating unacceptable operating constraints. The proposal should also cover commissioning, operator information, diagnostics, warning functions, maintenance, warranty, and service support.
Most importantly, buyers should distinguish between an RECD manufacturer's certification and a general claim that a particular generator is “CPCB compliant.” Regulatory compliance is broader than the product itself and can depend on the current requirements applicable to the generator and its location.
Don't Choose by Certification Alone
Certification is essential, but it should not be the only comparison criterion. Imagine two technically certified systems for the same general power range. One supplier offers the equipment alone. Another supplies the equipment with a site survey, installation, commissioning, operator training, warranty, and continuing service support.
For a facility where generator availability is critical, the second proposal may provide greater practical value even if the equipment price is higher. This is why the full project scope should be compared instead of ranking products solely by purchase price.
Verify the Latest CPCB Information
CPCB maintains official information on RECD certification and generator-set requirements, but published lists, procedures, and regulatory directions can be updated. The current official material should therefore be checked before placing an order. The CPCB vendor list currently identifies certified RECD manufacturers as of 9 May 2025, so it should not be treated as an eternal or automatically current list for every future procurement decision.
The relevant State Pollution Control Board or Pollution Control Committee requirements should also be reviewed, particularly where local consent conditions or additional environmental directions apply.
The Best RECD Is the Best-Matched RECD
There is no single RECD system that can honestly be declared the best for every DG set in India. The stronger choice is the system whose certification and application range correspond to the actual engine, whose installation can be engineered appropriately, whose diagnostics and monitoring are practical for the facility, and whose supplier can support the equipment over its operating life.
This application-focused approach also helps prevent a common procurement mistake: selecting equipment based on a generic kVA category while overlooking the specific engine characteristics.
Conclusion
The market for DG-set emission-control systems should be evaluated through engineering evidence rather than advertising claims. CPCB's RECD framework provides a defined technical basis for applicable in-use diesel genset engines up to 800 kW gross mechanical power, including requirements related to certification, installation, diagnostics, operator warnings, and maintenance. The CPCB-published manufacturer list also demonstrates that certified RECD solutions cover different power ranges and phases, meaning that application matching remains essential. Before purchasing, generator owners should verify the latest CPCB information and the requirements applicable to their particular DG set, facility, and location. A properly documented and correctly installed RECD is far more valuable than an unsupported “CPCB approved” claim.
Frequently Asked Questions
Which RECD is best for a DG set?
The best RECD is the one whose certified application matches the specific engine and whose installation, monitoring, maintenance, and service requirements suit the facility. There is no universal best model for every DG set.
Does CPCB certify RECD manufacturers for different power ranges?
Yes. CPCB publishes information identifying certified RECD manufacturers and the applicable ranges of in-use diesel genset engine power, along with certification agencies and applicable phases.
Can two DG sets with the same kVA use the same RECD?
Not automatically. Engine model, gross mechanical power, application range, and other technical characteristics should be checked before using the same RECD specification.
What should I compare besides RECD price?
Compare certification documentation, engine compatibility, installation scope, monitoring and diagnostics, warranty, maintenance requirements, spare-parts support, commissioning, and after-sales service.
Does a certified RECD automatically guarantee complete CPCB compliance?
No. The device must be appropriate for its application and correctly installed and operated, while the owner must also meet the current regulatory requirements applicable to the specific generator, facility, and location.
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