RECD compliance for diesel generatorsEnsuring requires more than purchasing a retrofit device and attaching it to the exhaust. A proper compliance process starts with identifying the generator, understanding the applicable CPCB framework, selecting an appropriate RECD, verifying its documentation, completing the installation correctly and maintaining the system according to the manufacturer's requirements.

For generator owners, the key point is that “compliance” should not be treated as a single certificate or marketing claim. The applicable requirements must be checked for the specific DG set, RECD model and installation.

Start With the DG Set

The first step is to establish exactly which generator is being evaluated.

Before contacting an RECD manufacturer, collect the engine manufacturer, exact engine model, engine serial number, gross mechanical power, DG rating, rated speed and existing exhaust information. The information should preferably be taken from the generator and engine nameplates or manufacturer documentation rather than an approximate conversion from kVA.

This distinction matters because CPCB's RECD framework is organized around specific engine applications and gross mechanical power. The published procedure covers diesel power-generating-set engines up to 800 kW gross mechanical power. A plant with several DGs should maintain this information separately for each generator. Two generators in the same facility may have different engines and therefore require different product verification.

Understand Whether an RECD Applies

Before buying anything, determine why the RECD is being considered. The reason may be an applicable regulatory requirement, an emissions-control project, an existing-DG retrofit strategy or another site-specific objective. These situations should not automatically be treated as identical.

CPCB's published procedure describes RECD applications for different engine categories and testing conditions. It is therefore important to establish the specific regulatory and technical context before making a purchase decision. The facility should also check current information from CPCB and the relevant State Pollution Control Board, Pollution Control Committee or other competent authority. CPCB's website remains the appropriate place to check current official information rather than relying on an old article or supplier message.

Select the Exact RECD Model

Once the generator information is confirmed, the next step is selecting the appropriate RECD model. A quotation that simply says “RECD system” is not enough. The proposal should identify the manufacturer, exact model/type, applicable engine range and other product-identification details.

CPCB's documentation framework requires detailed information about the company, manufacturing plant and proposed RECD models. The supplier-profile format includes the company type, manufacturer/retrofitter/importer status, plant addresses for manufacturers and specific RECD model information.

The buyer should therefore be able to connect:

Manufacturer → Exact model → Application → Relevant approval/testing documentation

If that chain is unclear, clarification should come before the purchase order.

Verify Type Approval and Testing

Type Approval is one of the most important technical checks in an RECD procurement. CPCB's procedure identifies approved technical agencies for Type Approval and subsequent conformity-of-production verification. The published list includes ARAI, ICAT, IIP and VRDE, with provision for appropriately NABL-accredited testing and certification agencies meeting the stated requirements. CPCB notes that the list may be revised from time to time.

When reviewing supplier documents, check the exact model, engine application, certification agency and relevant approval information. Do not treat a screenshot carrying the words “CPCB approved” as sufficient evidence. Product-specific documentation is much more useful.

Match the Product to the Engine

A genuine RECD may still be unsuitable for a particular generator. The buyer should ask the manufacturer to confirm the applicability of the exact model to the engine and gross mechanical power in question.

CPCB's published manufacturer information and RECD procedure distinguish between different engine applications and power ranges. The Type Approval process evaluates the RECD and engine combination rather than treating all DG sets as interchangeable.

This is why a supplier should receive detailed engine information before confirming the product.

Check the Existing Exhaust Arrangement

The physical installation is the next important stage. The supplier should evaluate the existing exhaust pipe, flange arrangement, silencer, routing, supports, available space and maintenance access. A technically appropriate RECD can still create problems if the site is not assessed before installation.

CPCB's RECD procedure addresses exhaust back pressure as part of the technical evaluation.

A site survey is therefore advisable where fabrication or exhaust modification may be required. The installation quotation should clearly state whether survey work, fabrication, mounting, transportation and commissioning are included.

Complete the Installation Properly

Installation should follow the applicable product and manufacturer requirements. The facility should ensure that the equipment supplied is the same model identified in the purchase documents and technical documentation. Any required fabrication should be performed according to the agreed scope.

The installation team should also complete the appropriate commissioning and handover process. At the end of the project, the facility should have a record of the RECD model, unique identification information, installation date, DG identification and relevant commissioning information.

Verify Product Identification After Delivery

CPCB's procedure includes conformance-labelling requirements for RECDs. These requirements include information such as the manufacturer or Type Approval certificate holder, manufacturing plant, RECD model, class, identifying part number, unique identification number, manufacturing date and Type Approval certificate number.

When the equipment arrives, compare the physical label with the documentation. This simple check can identify discrepancies before installation. If the delivered model does not match the quotation or supporting documents, the difference should be resolved before the device is commissioned.

Maintain the RECD After Installation

Compliance is not a one-time procurement event. CPCB's published procedure states that the RECD system is intended to comply with applicable provisions during normal operation when the system is used and maintained according to the manufacturer's instructions.

The maintenance requirements depend on the specific technology and model. The facility should therefore obtain the manufacturer's maintenance schedule and keep records of inspections, operating hours, service visits, faults and replacement components. A poorly maintained system cannot simply rely on the fact that the product originally received Type Approval.

Keep a Complete Compliance File

Every DG equipped with an RECD should have a dedicated technical file. The file can contain the generator nameplate details, engine model, gross mechanical power, RECD manufacturer, exact model, product identification, Type Approval/testing information, installation report, commissioning record, warranty and maintenance history.

This becomes especially useful when a facility operates several DG sets or when responsibility for the generators changes between maintenance teams. Documentation also makes it easier to answer future questions about which RECD was installed and why it was selected.

Choosing an RECD Manufacturer in India

RECD manufacturer in IndiaWhen evaluating an , buyers should examine more than the equipment price. A serious manufacturer should be able to explain the exact model's application, provide relevant technical documents, identify the testing/certification agency and support installation and after-sales service.

CPCB's published supplier documentation includes company identity, manufacturer/retrofitter/importer status, plant details and proposed RECD models, reinforcing the importance of knowing exactly who is supplying and manufacturing the device. The buyer should also compare warranty, spare-parts availability, service response and installation capability.

Don't Confuse Product Approval With Complete Site Compliance

One of the most important precautions is to distinguish the RECD product's Type Approval from the overall compliance status of the DG installation. A product may have relevant approval or testing documentation, yet the facility may have additional requirements arising from its location, generator characteristics, operating conditions or current regulatory directions.

CPCB's official website provides current information and communications, while the applicable State/UT pollution-control authority may have additional requirements. For 2026 projects, verify the current official position before describing a generator as “fully compliant.”

Where the RECD manufacturer in India Fits Into the Process

RECD manufacturer in IndiaThe is an important part of the compliance chain, but the manufacturer's responsibility should not be confused with the facility owner's entire regulatory obligation. The manufacturer supplies the product and relevant product documentation. The installer handles the physical retrofit and commissioning according to the agreed scope. The generator owner remains responsible for ensuring that the overall operation of the DG complies with the requirements applicable to the site.

A good manufacturer should make that division of responsibility clear rather than promising universal compliance without reviewing the generator.

Frequently Asked Questions

Is installing an RECD enough to establish compliance?

No. The exact RECD, engine application, installation, maintenance and current regulatory requirements should all be verified.

What is the first step in an RECD compliance review?

Start with the DG engine. Confirm the engine model and gross mechanical power before selecting or evaluating an RECD.

What Type Approval information should a buyer check?

Verify the exact RECD model, applicable engine/application and the relevant testing or certification agency documentation.

Can one RECD model be used on every DG in a plant?

Not automatically. Each application should be verified against the product's documented engine and power range.

Where should current CPCB requirements be checked?

Use CPCB's current official publications and website, and also verify applicable requirements with the relevant State/UT pollution-control or other competent authority.

Conclusion

documented technical processEnsuring RECD compliance for a diesel generator is best treated as a , not a single purchase. Begin with the generator's actual engine information. Confirm the applicable requirement, select the exact RECD model, verify Type Approval/testing documents, inspect the site, complete the installation correctly and maintain the system according to the manufacturer's instructions.True compliance is not established by a label alone. It comes from the right product, the right engine application, proper installation, proper maintenance and verification of the current requirements that apply to the site.

How to Ensure RECD Compliance for Diesel Generators — Step-by-Step Guide

A Complete Walkthrough of Steps to Confirm and Achieve RECD Compliance for Your Generator