Choosing the right RECD manufacturer in Delhi requires more than searching for the cheapest quotation or the company with the strongest online presence. For a DG owner, the right manufacturer should offer a suitable RECD model for the engine, relevant technical documentation, proper installation support, warranty and dependable after-sales service.

Delhi buyers also have access to the wider NCR market, where manufacturers and technical companies operate from Noida, Gurugram and other nearby industrial areas. The best choice should therefore be based on technical suitability and service capability, not simply the address printed on a company website. CPCB has published a procedure for emission-compliance testing of Retrofit Emission Control Devices (RECDs) for diesel power-generating-set engines up to 800 kW gross mechanical power. The procedure was revised on July 24, 2023.

Start With Your DG Set

Before contacting an RECD manufacturer, prepare the technical information for your generator.

You should have:

• Engine manufacturer

• Exact engine model

• Engine serial number

• Gross mechanical power

• DG rating in kVA

• Rated speed

• Existing exhaust configuration

• Installation location

• Number of DG sets

This information is essential because RECD selection is linked to the engine application and power range.

CPCB's procedure specifically uses gross mechanical power in defining the scope of the RECD framework, rather than relying only on the generator's kVA rating.

1. Check Whether the Company Is Actually a Manufacturer

One of the first questions to ask is:

“Do you manufacture the RECD or only supply/install it?”

There can be an important difference between:

Manufacturer

The company develops/manufactures the product and is responsible for the product specifications.

Supplier

The company sells equipment manufactured by another organization.

Installation provider

The company installs or services an RECD but may not manufacture it.

Turnkey provider

The company may coordinate equipment, installation and support.

For procurement and certification purposes, you should know exactly which organization manufactured the device.

CPCB's documentation specifically requires manufacturer-related information and identifies the RECD manufacturer, model and application in the approval process.

2. Ask for the Exact RECD Model

Never approve an order simply for:

“RECD for DG set – 1 unit.”

The quotation should identify:

• Manufacturer

• RECD type/model

• Product series

• Applicable engine range

• Part number, where applicable

• Quantity

The same manufacturer may have several products designed for different applications.

The exact model should also match the technical documentation provided by the supplier.

3. Verify the Engine Application

This is one of the most important checks.

Ask the manufacturer:

Is this exact model suitable for my engine?

What gross mechanical power range does it cover?

Which Phase applies?

What documentation supports this application?

CPCB's published manufacturer information lists RECD manufacturers according to different in-use diesel genset engine-power ranges and Phase I/Phase II applicability.

Therefore, don't assume that a product marketed for a particular kVA category is automatically appropriate for every engine in that category.

4. Review Certification and Testing Documents

A serious manufacturer should be able to provide relevant documents for the product being proposed.

Depending on the application, request:

• Type Approval information

• Test documentation

• Certification agency information

• Product datasheet

• Application range

• Installation instructions

• Maintenance manual

CPCB's RECD procedure describes how manufacturers submit RECD families/types for testing and approval and also requires approved RECDs to be accompanied by identifying and installation/service information.

The documents should correspond to the exact product you are buying.

5. Don't Select a Manufacturer Based Only on CPCB Claims

A supplier may advertise:

“CPCB approved RECD manufacturer.”

That statement should lead to verification, not automatic acceptance.

Ask:

• Which exact product?

• Which engine application?

• Which testing/certification agency?

• Which Phase?

• What supporting certificate or document?

• Is the information current?

CPCB also maintains official generator-set resources, including Type Approval/COP information.

For 2026 purchases, check the latest official information instead of relying solely on older articles or supplier advertisements.

6. Compare Product Technology

RECD products can use different combinations of emission-control technologies.

Depending on the product, these may include:

• DPF

• DOC

• SCR

• Sensors

• Controllers

• Regeneration systems

• Monitoring systems

Aceget, for example, describes DPF, DOC and SCR technologies across its RECD product platform.

The objective is not to select the product with the most technical terms in its brochure. Instead, ask whether the technology is appropriate for your particular generator and whether relevant performance information is documented.

7. Examine Installation Capability

An RECD manufacturer should ideally be able to explain how the proposed product will be installed.

Ask whether the supplier provides:

• Site survey

• Exhaust measurement

• Fabrication

• Mounting

• Installation

• Commissioning

• Maintenance support

The installation team should inspect:

• Exhaust-pipe diameter

• Flanges

• Silencer

• Pipe routing

• Mounting space

• Supports

• Maintenance access

CPCB's RECD procedure includes exhaust back pressure within its testing framework.

That makes exhaust planning an important part of product selection.

8. Evaluate Delhi-NCR Service Coverage

A manufacturer may be based in Noida or Gurugram but still provide effective service to Delhi.

Ask:

• Do you have a Delhi service team?

• How quickly can a site survey be arranged?

• Where is the nearest technical team?

• Are warranty visits available?

• Are spare parts available in NCR?

• What are the travel charges?

Aceget's official Delhi page states that its Delhi operation provides site inspection, professional installation and after-sales maintenance support, while its manufacturing facility is listed in Noida.

For Delhi buyers, this type of regional service structure can be useful.

9. Check Warranty Carefully

Before choosing a manufacturer, compare:

• Warranty period

• Warranty start date

• Covered components

• Labour coverage

• Site visits

• Replacement parts

• Exclusions

• Claim procedure

A longer warranty is useful only when the actual coverage is clear.

Also ask whether installation must be performed by the manufacturer or an authorized service provider for the warranty to remain valid.

10. Look Beyond the Initial Purchase

Industrial facilities should consider the complete operating life of the RECD.

Ask about:

• Maintenance frequency

• Spare parts

• Sensor replacement

• Controller maintenance

• Regeneration requirements

• Service visits

• Post-warranty support

For a plant running several generators, these recurring costs can become significant over time.

A manufacturer with strong after-sales service may therefore provide greater practical value than a supplier offering only a low initial price.

11. Check Manufacturer Experience With Your DG Type

Ask the manufacturer whether it has experience with:

• Your engine brand

• Similar engine models

• Similar power ranges

• Similar exhaust arrangements

• Similar industrial applications

Experience with the exact or similar application can make installation and troubleshooting easier.

Don't rely only on a general statement such as:

“We have supplied thousands of RECDs.”

Ask whether the supplier has experience relevant to your generator.

12. Be Careful With Performance Claims

Manufacturers may publish statements about particulate or gaseous emission reduction.

Before using these numbers in procurement documents, ask:

• Which pollutant?

• Which model?

• Which engine?

• What baseline?

• What testing conditions?

• Which testing agency?

• Does the result apply to the proposed application?

CPCB's test procedure includes parameters such as PM, CO, HC, NOx, smoke, specific fuel consumption, regeneration characteristics and exhaust back pressure.

A performance figure should therefore be understood in the context of the test and product to which it applies.

13. Shortlist More Than One Manufacturer

For a significant industrial purchase, obtain comparable proposals from several manufacturers.

Give every company the same:

• Engine details

• Gross mechanical power

• DG rating

• Exhaust information

• Quantity

• Installation location

Then ask each company for:

Exact model + documentation + installation scope + warranty + total price

This creates a fairer comparison.

14. Where the DG set RECD device Fits Into the Selection

The DG set RECD device should not be evaluated as an isolated component.

Look at the entire solution:

Product

→ Is it appropriate for the engine?

Documentation

→ Can its application be verified?

Installation

→ Can it be integrated correctly?

Maintenance

→ Can the plant support it long-term?

Service

→ Can technical assistance be obtained when required?

This approach provides a much more useful basis for choosing a manufacturer.

15. Don't Assume Certification Equals Complete Site Compliance

A product may have relevant type-approval documentation, but that does not automatically establish complete regulatory compliance for every installation.

The final regulatory position can depend on:

• DG specifications

• RECD model

• Installation

• Location

• Current requirements

• State/UT provisions

• Site-specific directions

Therefore, buyers should distinguish between:

Product certification

and

overall site compliance.

For Delhi projects, verify the current requirements applicable to the particular DG through the relevant official authorities.

16. Questions to Ask Before Choosing Your Manufacturer

Before signing the purchase order, ask:

1. Which exact RECD model are you recommending?

2. Why is it suitable for my engine?

3. What gross mechanical power range does it cover?

4. What relevant certification/test documentation is available?

5. Which certification agency is identified?

6. Is installation included?

7. Is exhaust fabrication included?

8. What warranty is provided?

9. What maintenance and spare parts are required?

10. What is the complete installed project cost?

The answers should be documented wherever possible.

Manufacturer Selection Checklist

Before selecting an RECD manufacturer in Delhi:

Company

• Manufacturer status confirmed

• Delhi/NCR service availability checked

• Relevant RECD experience verified

Product

• Exact model identified

• Engine application verified

• Gross mechanical power matched

• Technical datasheet received

Certification

• Relevant documentation reviewed

• Certification agency identified

• Current official information checked

• No unsupported approval claims accepted

Installation

• Site survey

• Exhaust assessment

• Fabrication

• Installation

• Commissioning

Lifecycle

• Warranty

• Maintenance

• Spare parts

• Service support

Commercial

• Equipment price

• Installation price

• Complete project cost

Conclusion

Choosing an RECD manufacturer in Delhi should be a technical procurement decision rather than a simple search for the nearest or cheapest company. Begin by identifying the exact DG engine and gross mechanical power. Then shortlist manufacturers whose products have documented applicability for your generator. Request the exact RECD model and compare supporting documentation, installation capability, performance information, warranty and service. CPCB's published RECD procedure provides the formal framework for testing and type approval of applicable retrofit devices, but a manufacturer's general “CPCB approved” statement should not be treated as automatic proof of complete site compliance.