Choosing the right RECD supplier for DG sets is an important decision for businesses that rely on diesel generators and need an appropriate emissions-control solution. The supplier you select can affect not only the initial equipment cost but also installation quality, documentation, maintenance, warranty support and long-term service.

CPCB's published RECD procedure provides a framework for compliance testing of retrofit emission-control devices for applicable in-use diesel power-generating-set engines up to 800 kW gross mechanical power. Because applicability can depend on the specific generator, engine, power range and applicable phase, buyers should verify current official requirements before purchasing.

What Is an RECD Supplier?

An RECD supplier may be an original manufacturer, authorized distributor, dealer or system integrator offering retrofit emission-control equipment for diesel generator applications.

However, these terms should not be treated as interchangeable.

Before placing an order, establish whether the company is:

• The original manufacturer

• An authorized distributor

• A dealer

• An installation contractor

• A system integrator

This distinction matters because product documentation, warranty responsibility, technical support and spare-parts arrangements may differ.

Ask One Simple Question

Who manufactured the exact RECD model quoted in this proposal?

The answer should be clear and supported by appropriate documentation.

Start With Your DG Set Details

The supplier cannot properly evaluate an application without accurate generator information.

Prepare the following details before requesting quotations:

• DG-set manufacturer

• Engine manufacturer

• Engine model

• Engine serial number

• DG rating in kVA

• Gross mechanical power in kW

• Existing exhaust arrangement

• Installation location

• Photographs of the generator nameplate

• Photographs of the exhaust system

CPCB's published manufacturer information identifies RECD applicability according to ranges of in-use diesel genset engine power in kW.

Therefore, providing only a “500 kVA DG set” may not be enough for a proper technical evaluation.

Why Engine Information Matters

Two generators with similar kVA ratings may have different engines, configurations and technical characteristics.

A responsible supplier should therefore ask for the actual engine details before recommending a product.

If a supplier immediately quotes a generic RECD without asking about your generator, request clarification about how product applicability was determined.

Check the Exact Product Being Offered

Avoid buying based on a generic description such as:

“RECD for diesel generator.”

Ask for the exact:

• Product name

• Model number

• Technical specifications

• Applicable engine-power range

• Phase information

• Installation requirements

The same model number should appear consistently across the quotation, technical proposal and relevant supporting documents.

Understand CPCB-Related Documentation

CPCB's published RECD procedure describes requirements related to type approval, testing and conformity-of-production verification for applicable retrofit emission-control devices.

For this reason, buyers should not rely solely on advertising statements such as:

• “CPCB approved”

• “CPCB certified”

• “100% compliant”

• “Suitable for every DG”

Instead, ask the supplier for documentation relevant to the exact product being proposed.

Important information may include:

• Product/model identification

• Manufacturer

• Applicable engine-power range

• Phase

• Certification/test information

• Certification agency

CPCB's published manufacturer information identifies certification agencies and applicability for listed manufacturers.

Verify the Complete Connection

A useful procurement check is:

Manufacturer → Product Model → Engine Range → Phase → Supporting Documentation

This is much stronger than accepting a general compliance statement.

Evaluate the Exhaust Installation

An RECD installation must be considered alongside the existing DG exhaust system.

The supplier may need information about:

• Exhaust-pipe diameter

• Flange dimensions

• Silencer configuration

• Pipe routing

• Available mounting space

• Accessibility

• Existing supports

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

Therefore, installation should be evaluated carefully rather than treated as a simple equipment-delivery activity.

Ask About Site Inspection

For complicated installations, ask whether the supplier can perform a site assessment before finalizing the equipment.

A site inspection can help identify:

• Space limitations

• Fabrication requirements

• Mounting arrangements

• Exhaust modifications

• Maintenance access

What Should a Good Quotation Include?

A professional quotation should clearly separate equipment and services.

Look for:

Equipment

Exact RECD model and quantity.

Accessories

Any required controllers, sensors or other components, as applicable.

Installation

Labour and installation scope.

Fabrication

Any exhaust-related modifications.

Transportation

Freight and delivery charges.

Commissioning

Technical commissioning and agreed documentation.

Warranty

Duration and coverage.

Service

Post-installation technical assistance.

A quotation that simply says “RECD — ₹___” does not provide enough information for a meaningful comparison.

Warranty Should Be Examined Carefully

Warranty is more than a number of years printed on a quotation.

Ask:

• When does the warranty begin?

• What components are covered?

• Are labour charges included?

• Are site visits covered?

• Are replacement parts covered?

• What exclusions apply?

• How is a warranty claim initiated?

Ask About the Warranty Start Date

Equipment may be delivered weeks before installation.

Therefore, clarify whether the warranty starts from:

• Dispatch

• Delivery

• Installation

• Commissioning

The manufacturer's written warranty terms should be the basis for your decision.

After-Sales Service Matters

An RECD supplier should ideally have a defined process for handling post-installation issues.

Ask about:

• Technical helpline

• Service engineers

• Remote troubleshooting

• Site visits

• Preventive maintenance

• Spare parts

• Warranty support

For businesses that depend heavily on DG backup power, timely technical assistance can be particularly important.

Check Spare-Parts Availability

Before purchasing, ask:

Which parts may require replacement?

Are replacement components available in India?

Who supplies them?

How are they ordered?

Is technical assistance available during replacement?

For organizations operating multiple generators, spare-parts planning can become an important part of long-term maintenance.

Don't Ignore Installation Support

A supplier that provides equipment but leaves the customer to arrange all installation work may offer a different overall value than a supplier providing complete technical support.

Determine whether the quotation includes:

• Site inspection

• Installation

• Exhaust fabrication

• Electrical/control connections, where applicable

• Commissioning

• Installation documentation

Make the scope explicit before signing the purchase order.

Delivery and Logistics

Ask the supplier about:

• Production time

• Dispatch schedule

• Transportation

• Expected delivery date

• Packaging

• Site unloading

• Multi-site delivery, if applicable

If the project involves multiple generators, ask whether delivery can be coordinated according to the installation schedule.

What About Online Purchasing?

Digital procurement can make supplier discovery and quotation collection easier.

Businesses may search for products using terms such as buy RECD for generators online and compare suppliers, specifications and prices before contacting a manufacturer.

However, online availability should not replace technical verification.

Before purchasing online, confirm:

• Seller identity

• Exact product model

• Manufacturer

• Applicability

• Documentation

• Warranty

• Installation arrangements

• Delivery terms

• Return/replacement conditions, where applicable

For a technical product connected to an existing DG exhaust system, the buyer should understand the application before placing an online order.

Genuine Product vs Generic Offering

One of the most important supplier-evaluation steps is determining exactly what is being supplied.

Be cautious if a seller:

• Refuses to provide a product model

• Cannot explain applicability

• Provides only generic brochures

• Makes broad compliance claims without supporting documents

• Cannot explain warranty responsibility

• Avoids technical questions

A professional supplier should be able to explain the product and its intended application clearly.

Evaluate the Manufacturer's Experience

Experience is not a substitute for documentation, but it can be useful.

Ask whether the supplier has handled:

• Similar engine models

• Similar power ranges

• Industrial DG installations

• Commercial facilities

• Multi-DG projects

• Complex exhaust configurations

You can also ask for general project references where commercially appropriate.

Questions to Ask Before Buying

Before finalizing an order, ask the supplier:

Technical

What RECD model is suitable for my exact engine?

Applicability

What engine-power range does the model cover?

Regulatory

What supporting certification/test documentation is available?

Installation

Will you evaluate the existing exhaust arrangement?

Commercial

Does the quotation include installation, fabrication and transportation?

Warranty

What components and services are covered?

Service

Who handles technical complaints after installation?

Spare Parts

How will replacement components be supplied?

Written answers are preferable for important technical and commercial matters.

Red Flags During Supplier Selection

Watch for these warning signs:

Extremely Low Pricing

A very low price may exclude installation, accessories or service.

No Technical Questions

A supplier should understand the DG before recommending equipment.

Generic Certification Claims

Ask for product-specific documentation.

Unclear Warranty

Insist on written terms.

No Service Information

Find out who will provide post-installation support.

No Model Number

You should know exactly what you are purchasing.

Final Pre-Order Checklist

Before issuing the purchase order, confirm:

• DG-set details verified

• Engine model confirmed

• Gross mechanical power confirmed

• Exact RECD model identified

• Product applicability checked

• Phase information verified

• Technical datasheet received

• Certification/test documentation reviewed

• Manufacturer/supplier identity confirmed

• Site requirements evaluated

• Exhaust arrangement checked

• Installation scope defined

• Fabrication scope defined

• Commissioning included or excluded clearly

• Transportation confirmed

• Warranty terms received

• Warranty start date understood

• Spare-parts support confirmed

• Service process understood

• Total project cost calculated

• Current official requirements verified

Why the Right Supplier Matters

The supplier you choose can influence the entire ownership experience.

A technically capable supplier can help with:

Product selection — Matching the proposed equipment to the generator application.

Documentation — Providing relevant technical and certification information.

Installation — Coordinating integration with the existing exhaust arrangement.

Commissioning — Completing the agreed installation and commissioning scope.

Warranty — Providing a defined process for resolving covered issues.

Service — Supporting the system after installation.

This is why procurement should evaluate the complete supplier package rather than focusing only on the equipment price.

Verify Current CPCB Requirements

CPCB maintains official information relating to generator sets and RECD-related requirements, including manufacturer information and testing procedures.

The published manufacturer information is dated May 9, 2025, so buyers making a current 2026 procurement decision should check whether a newer official update is available.

Also consider whether the particular installation is subject to requirements or directions from the relevant State Pollution Control Board or Pollution Control Committee.

Do not treat an old article, marketplace listing or supplier advertisement as the final authority on current compliance requirements.

Final Thoughts

Choosing an RECD supplier should be approached as a technical and commercial evaluation rather than a simple price comparison. Start by identifying the exact DG-set and engine details. Then verify the proposed RECD model, applicable engine-power range, phase and supporting documentation. After that, examine installation requirements, delivery, warranty, spare parts and after-sales support. For businesses looking for an RECD supplier for DG sets, the strongest purchasing decision is one based on verified product applicability, transparent documentation, clearly defined scope and dependable long-term support. Online purchasing and supplier discovery can make procurement faster, including searches to buy RECD for generators online, but the convenience of online ordering should never replace application-specific technical verification.