Buying an RECD device as per CPCB norms requires more than comparing prices or choosing a product based on a “CPCB approved” label. For a generator owner, one of the most important purchasing decisions is determining whether the exact product being offered has appropriate technical documentation, identification, applicability and supporting certification information.

The Central Pollution Control Board (CPCB) has established a procedure for emission-compliance testing of Retrofit Emission Control Devices for applicable in-use diesel power-generating-set engines. The procedure includes requirements relating to RECD families, type approval, testing and information that must accompany an approved RECD.

What Makes an RECD Product Genuine?

A genuine RECD should be identifiable as a specific product rather than simply being described as a generic pollution-control device.

CPCB's published procedure specifies that each RECD should carry or be accompanied by information including:

• Manufacturer name or trademark

• Make and identifying part number

• RECD family information

• Applicable engine/family information

• Retrofit installation instructions

• End-user service and maintenance instructions

These details help connect the physical product with its technical documentation.

Therefore, a buyer should be cautious if a supplier cannot clearly identify the exact model being supplied.

Why the Exact Model Matters

An RECD certificate or approval-related document should not be treated as a blanket approval for every product sold by a company.

CPCB's procedure describes RECD families and explains that type approval involves testing of a parent RECD model, with provisions for additional models or extension to models within an already certified family.

For buyers, this means the following information matters:

Manufacturer → Exact Model → RECD Family → Applicable Engine/Power Range → Supporting Documentation

The chain should be clear.

If a quotation only says “CPCB-approved RECD” without providing the product model or relevant documentation, request clarification before proceeding.

Genuine Product vs Generic Pollution-Control Device

The market may contain various devices marketed for diesel-generator emission control.

Not every exhaust-treatment product should automatically be described as an RECD under the CPCB framework.

A generic emission-control product may have a useful technical purpose, but the buyer should not assume that it has the same certification status or applicability as a product covered by the RECD procedure.

The safest approach is to ask the supplier:

“What exact RECD model are you supplying, and what official documentation supports its applicability?”

The answer should be specific and verifiable.

Check the Manufacturer Information

CPCB has published information on RECD manufacturers and the applicable ranges of listed products.

For example, one CPCB-published list identifies RECD vendors together with applicable ranges of in-use diesel generators and the certification agency associated with the listed products. It also notes that the RECD-plus-engine combinations are tested for mechanical gross power in kW, with corresponding kVA ratings to be checked against the relevant data plates.

This is an important lesson for buyers:

Do not match an RECD only by the advertised kVA range.

The underlying engine and its technical characteristics also need to be considered.

What Does “CPCB Approved” Really Mean?

The phrase “CPCB approved” can be used loosely in marketing material.

A responsible buyer should ask what the supplier means by that statement.

Request:

1. Exact manufacturer name

2. Exact RECD model

3. RECD family, where applicable

4. Applicable engine range

5. Applicable power range

6. Phase applicability, where relevant

7. Certification/test information

8. Certification agency

9. Installation documentation

10. Maintenance documentation

This does not mean that every document needs to be interpreted by the generator owner personally. The purpose is to establish a clear documentation trail.

Verify the Certification Agency

CPCB's published RECD information identifies certification agencies associated with listed products. The published list includes agencies such as ARAI and ICAT.

When a supplier provides certification information, check that:

• The manufacturer name matches.

• The model information is identifiable.

• The application range is clear.

• The certification/test reference is relevant.

• The information corresponds to the product being quoted.

A document that cannot be connected to the actual product should be treated carefully.

Why Product Documentation Matters

Documentation is one of the easiest ways to distinguish a properly supported product from a vague compliance claim.

CPCB's procedure specifically states that an RECD should be accompanied by installation instructions and an end-user service manual containing maintenance instructions.

Before purchasing, ask for copies of relevant documentation.

At minimum, the buyer should understand:

• What product is being purchased

• Which engine applications it covers

• How it should be installed

• How it should be maintained

• What technical limitations apply

A professional supplier should be able to explain these points.

Warning Sign: No Exact Product Identification

Be cautious if the supplier provides only:

“RECD system for DG set”

without identifying a model.

The product should have a clear identity.

Ask for:

Manufacturer + Model + Part Number + Applicable Range

This information is particularly useful when multiple DG sets are installed at the same facility.

Warning Sign: Only a Brochure Is Provided

A marketing brochure can explain product features, but it is not necessarily sufficient evidence of certification or applicability.

A brochure may contain statements such as:

• CPCB compliant

• CPCB approved

• Pollution control

• Certified technology

However, the buyer should request the underlying technical and certification information relevant to the exact product.

Marketing material and official technical documentation serve different purposes.

Warning Sign: Supplier Does Not Ask About Your Engine

A genuine technical evaluation should begin with the generator.

If a supplier recommends exactly the same product without asking for:

• Engine manufacturer

• Engine model

• Engine power

• Engine phase

• Existing exhaust details

the buyer should ask how the product's suitability was determined.

An RECD is a retrofit solution, so application matching matters.

Warning Sign: Product Selected Only From kVA

A supplier may say:

“Your generator is 500 kVA, so this RECD will fit.”

That may not be enough information.

CPCB's published material emphasizes the relationship between the tested RECD and engine mechanical gross power, while the corresponding kVA rating should be verified using the data plates of the engine and DG set.

Therefore, provide the engine details rather than relying exclusively on kVA.

Warning Sign: No Installation Instructions

Installation is not something that should be improvised.

CPCB's procedure specifically requires the RECD to be accompanied by retrofit installation instructions.

Ask the supplier:

• Where should the device be installed?

• What exhaust modifications are required?

• What mounting arrangement is needed?

• What electrical connections are required?

• What clearances are necessary?

• What maintenance access is required?

The exact answers will depend on the product.

Warning Sign: No Maintenance Information

A product should not be purchased without understanding its maintenance requirements.

CPCB's procedure refers to an end-user service manual containing maintenance instructions.

Before purchase, ask:

• What routine inspections are required?

• Which components need cleaning?

• Are sensors included?

• Are consumable components involved?

• What parts may need replacement?

• What service intervals are recommended?

A clear maintenance plan helps avoid future operational problems.

Genuine Product Does Not Mean “Install and Forget”

Even a properly documented RECD requires appropriate installation and maintenance.

The generator owner should keep track of:

• Installation date

• Product model

• Service history

• Maintenance activities

• Replacement components

• Technical inspections

• Warranty claims

The RECD should be treated as part of the overall DG-set system.

Examine the Exhaust System Before Installation

A genuine product can still be installed incorrectly.

Before installation, inspect:

Pipe Diameter

Confirm that the existing exhaust connection is compatible.

Exhaust Routing

Check bends, height and available space.

Mounting

Determine whether additional supports are needed.

Maintenance Clearance

Make sure technicians can access the equipment.

Back Pressure

Evaluate the effect of the retrofit on the exhaust system and the engine manufacturer's applicable limits.

CPCB's RECD testing procedure includes exhaust back pressure among the parameters considered in the technical framework.

How to Verify an RECD Before Buying

Use a simple verification process.

Step 1: Identify the DG Set

Record engine model, power and phase.

Step 2: Identify the RECD

Get the exact manufacturer, model and part number.

Step 3: Check Applicability

Confirm that the product's documented range matches the engine application.

Step 4: Request Supporting Documents

Ask for relevant test/certification documentation.

Step 5: Check Installation Requirements

Review the installation manual and exhaust requirements.

Step 6: Review Maintenance

Request the service and maintenance documentation.

Step 7: Compare the Complete Quotation

Include equipment, installation, fabrication, controls, commissioning and service.

Step 8: Verify Current Requirements

Check current CPCB information and applicable site/state requirements before finalizing a compliance-related purchase.

What About Very Low-Cost RECD Offers?

Price alone does not establish whether an RECD is genuine or compliant.

A very low quotation may be legitimate if the scope is different, but it may also exclude:

• Installation

• Exhaust fabrication

• Controls

• Sensors

• Commissioning

• Transportation

• Warranty

• Service

Therefore, never compare only the headline price.

Ask for an itemized quotation and compare the complete scope.

Don't Confuse “CPCB Listed” With Every Product From a Company

Another important point is product-specific verification.

A company may have multiple products, models or configurations.

The fact that a company appears in a CPCB-published list should not automatically be interpreted as evidence that every product sold by that company has identical certification or applicability.

CPCB's published information provides product/application details and certification-agency information for listed RECD vendors.

Always verify the exact product being purchased.

The Role of the Generator Owner

The owner does not need to become an emissions-testing expert.

However, the owner should insist on basic transparency.

Before purchase, the owner should know:

What am I buying?

Which generator is it intended for?

What documentation supports it?

Who certified or tested it?

How will it be installed?

How will it be maintained?

What does the quotation actually include?

These questions are simple but can prevent major procurement mistakes.

What Is a DG Generator Emission Control Device?

A DG generator emission control device is a broad term for equipment intended to control emissions from diesel-generator operation.

An RECD is a specific retrofit emission-control category covered by a CPCB testing and certification framework for applicable in-use diesel genset applications.

Therefore, a product should not be treated as an RECD merely because it is marketed as an emission-control device.

The product's exact identity and supporting documentation should be checked.

What Should You Do If a Supplier Cannot Provide Documents?

Do not immediately assume that the product is non-compliant.

Instead, ask the supplier to provide:

1. Exact model information

2. Applicable range

3. Certification/test documentation

4. Installation instructions

5. Maintenance instructions

6. Certification agency details

7. Manufacturer information

If the supplier repeatedly refuses or cannot provide basic product documentation, consider obtaining another quotation for comparison.

A compliance-related purchase should have a clear technical documentation trail.

Verify Current CPCB Information

CPCB's website is updated periodically and contains current announcements, technical material and regulatory information. Its official website currently shows updates to its important-announcements and regulatory sections.

Therefore, buyers should not rely exclusively on old articles, archived vendor brochures or outdated social-media claims.

Before finalizing a compliance-related purchase, verify the latest official information applicable to the generator.

Where relevant, also check requirements issued by the State Pollution Control Board or Pollution Control Committee responsible for the site.

Final Takeaway

The difference between a properly documented RECD and a product making an unclear compliance claim often comes down to verification. A genuine purchase should begin with the generator's technical information and end with a clear documentation trail. The exact RECD model, manufacturer, application range, certification/test information, installation instructions and maintenance documentation should all be identifiable. CPCB's procedure provides specific requirements around RECD type approval, testing, product identification and documentation. It states that each RECD should be accompanied by manufacturer/product identification, applicable family information, retrofit installation instructions and an end-user service manual containing maintenance instructions. For organizations searching for a DG generator emission control device, the safest purchasing approach is therefore not to accept a generic “CPCB approved” statement at face value. Ask for the exact product information and verify that the documentation corresponds to the equipment being offered.