If you are planning to upgrade an existing diesel generator, understanding the cost of an RECD device for diesel generators is only one part of the decision. The technology, DG set specifications, installation requirements, maintenance needs, and applicable environmental regulations can all influence the overall project.

The price of an emission-control device can vary significantly from one application to another. A small commercial generator and a large industrial DG set may require completely different configurations. This 2026 guide explains the major factors that influence RECD pricing, what installation involves, and how DG set owners should approach compliance and purchasing decisions.

What Is an RECD Device?

RECD stands for Retrofit Emission Control Device. It is an emission-control system designed to be installed on a suitable existing diesel generator. The purpose of the device is to help control targeted pollutants generated during diesel combustion. Depending on the technology, an RECD system may be designed to address pollutants such as:

• Particulate Matter (PM)

• Carbon Monoxide (CO)

• Hydrocarbons (HC)

• Visible smoke

The actual performance depends on the specific emission-control technology and the operating conditions of the generator.

Factors such as engine condition, exhaust temperature, operating load, exhaust flow, fuel quality, and maintenance can all influence the results. For this reason, an emission-control system should be selected according to the individual DG set rather than assuming that one standard device will suit every generator.

What Factors Influence RECD Price?

1. DG Set Capacity

The size of the generator is one of the primary factors influencing system selection.

Larger DG sets generally have different exhaust flow requirements and may require larger or more complex emission-control equipment.

2. Emission-Control Technology

Different technologies can have different costs.

For example, a system designed primarily for gaseous pollutant control may have different equipment requirements from one designed to capture particulate matter.

Some applications may also require a combination of technologies.

The technology should therefore be selected based on the pollutants that need to be addressed and the specific operating conditions of the DG set.

3. Exhaust System Configuration

The existing exhaust arrangement can affect installation costs.

If modifications are required, additional expenses may arise for:

• Exhaust pipe alterations

• Mounting arrangements

• Structural support

• Insulation

• Additional components

A site inspection can help identify these requirements before installation.

4. Installation Complexity

Installation costs can vary depending on:

• DG room layout

• Available space

• Exhaust pipe position

• Accessibility

• Required modifications

• Distance from the equipment

• Safety requirements

A straightforward installation may cost less than a project requiring significant exhaust-system modifications.

5. Testing and Commissioning

Depending on the project requirements, testing and commissioning may form part of the total project cost.

Businesses should ask whether these services are included in the quotation or charged separately.

6. Maintenance Requirements

The initial purchase price is not the only cost to consider.

Different technologies may have different requirements for:

• Cleaning

• Inspection

• Regeneration

• Filter replacement

• Sensor maintenance

• Spare parts

When comparing suppliers, consider the total cost of ownership rather than only the initial equipment price.

Why Exhaust Back Pressure Matters

When an emission-control device is added to an exhaust system, it can introduce additional resistance to the flow of exhaust gases.

This is known as exhaust back pressure.

If back pressure becomes excessive, it may potentially affect:

• Engine performance

• Exhaust temperature

• Fuel consumption

• Engine reliability

Therefore, the selected emission-control system should be appropriately sized and installed within the acceptable limits specified for the engine. Back-pressure evaluation should be part of the technical assessment before installation.

How CPCB Compliance Fits Into RECD Installation

CPCB requirements are an important consideration for many DG set owners.

However, compliance should not be determined solely by whether a supplier describes a product as "CPCB-approved."

The applicable requirements may depend on factors such as:

• DG set capacity

• Manufacturing date

• Engine specifications

• Location

• Applicable emission standards

• State Pollution Control Board requirements

• Local environmental regulations

• CAQM directions, where applicable

DG set owners should verify the latest applicable requirements for their specific equipment and location.

It is also important to understand that installing an emission-control device does not automatically guarantee complete regulatory compliance.

The overall compliance situation may involve the generator, emission-control equipment, installation, testing, documentation, and other applicable conditions.

How to Select the Right RECD Device

Before purchasing, evaluate the following:

DG Set Capacity

Confirm the system is appropriately sized for your generator.

Engine Model

Provide the exact engine manufacturer and model.

Exhaust Flow

The system should be capable of handling the generator's exhaust requirements.

Exhaust Temperature

Consider the generator's typical operating temperature and load conditions.

Operating Load

A generator running mainly at low load may have different requirements from one operating regularly at higher loads.

Back Pressure

Confirm that the proposed system will operate within the engine manufacturer's acceptable limits.

Maintenance

Understand what cleaning, inspection, regeneration, or replacement procedures may be required.

Common Mistakes When Buying an RECD

Focusing Only on Price

The lowest quotation may not represent the best overall value.

Not Checking Technical Compatibility

The system should be matched to the specific engine and exhaust characteristics.

Ignoring Installation Costs

Always ask whether installation, modifications, testing, and commissioning are included.

Failing to Verify Documentation

Review relevant technical and compliance documents before making a purchase.

Choosing Without a Site Assessment

A site inspection can identify potential installation challenges.

Neglecting Long-Term Maintenance

Consider future maintenance and operating expenses when comparing options.

How to Reduce the Overall Cost of an RECD Project

Businesses can potentially manage project costs by planning carefully.

Conduct a Technical Assessment First

Understanding the DG set's requirements before purchasing can help prevent incorrect equipment selection.

Compare Multiple Quotations

Request proposals from suitable suppliers and compare the complete scope.

Consider Total Cost of Ownership

Evaluate installation, maintenance, spare parts, and service costs in addition to the initial purchase price.

Select the Correct Technology

Avoid paying for unnecessary features or selecting an unsuitable technology simply because it is cheaper.

Plan Installation Properly

A well-planned installation can help reduce unexpected modification costs.

Conclusion

When evaluating an RECD device for diesel generators, DG set owners should look beyond the initial equipment price offered by an RECD supplier for DG sets. The final project cost can depend on generator capacity, emission-control technology, exhaust configuration, installation complexity, testing requirements, and long-term maintenance. Professional installation and regular maintenance are equally important. A correctly selected and properly maintained system can help organizations manage targeted diesel exhaust pollutants while supporting cleaner generator operations.