Summary: Somnandi Industries is an acoustic enclosure manufacturer in India that designs, fabricates, and installs custom soundproof enclosures for diesel generators, air compressors, turbines, blowers, and other industrial machinery. An acoustic enclosure is a fabricated steel housing lined with sound absorbing material that traps machine noise at the source, typically cutting noise output by 25 to 40 dB(A). This page is written for plant heads, EHS managers, procurement teams, and consultants in power, manufacturing, pharma, and infrastructure sectors who need to bring DG sets, compressors, or turbines within CPCB noise limits before commissioning or during a compliance audit.
Who Makes This Enclosure and Why It Is Built This Way
Somnandi Industries operates two fabrication units in Greater Noida with in house CNC cutting, welding, and powder coating lines, and has executed acoustic enclosure projects for large industrial groups including a gas turbine enclosure for Adani and an installation for Hindalco in Odisha. That field experience, not just catalog specifications, shapes every design decision below: panel gauge, door seal type, louver placement, and ventilation sizing are chosen based on what actually fails on-site in Indian industrial environments (dust ingress, monsoon humidity, and voltage fluctuations affecting exhaust fans), not just what passes a lab test.
What Is an Acoustic Enclosure?
An acoustic enclosure is a fabricated steel housing, typically built from 16 gauge CRCA or GI perforated sheet, filled with mineral wool or rockwool insulation, and finished with a perforated inner skin that absorbs sound energy before it escapes the machine footprint. Unlike a simple metal shed, it is engineered as a system: wall panels, acoustic doors, ventilation louvers, and vision panels are all acoustically rated together, because a single unsealed gap or an undersized louver can undo the sound reduction of an otherwise well built enclosure. This is the detail most buyers only learn after their first enclosure underperforms on-site.
Acoustic Enclosure vs Soundproof Enclosure vs Noise Enclosure: Is There a Real Difference?
In practice, no. Acoustic enclosure, soundproof enclosure, and noise enclosure describe the same category of product across different regions and industries in India. What actually varies between suppliers is the acoustic rating (STC value), the panel construction, and whether the unit is modular or site-welded. When comparing quotes, ask for the STC rating and test standard (IS-9901, DIN 52210, or ISO 140) rather than relying on the product name alone.
Why This Matters: The Compliance Angle Most Suppliers Skip
Under the CPCB Noise Pollution (Regulation and Control) Rules, industrial zones are capped at 75 dB(A) in the daytime and 70 dB(A) at night, and new diesel generator sets up to 1000 kVA must not exceed 75 dB(A) measured at one metre from the enclosure surface. Many first-time buyers size an enclosure purely on manufacturer brochure claims without accounting for reflected noise from nearby walls or open ventilation louvers, then fail the actual site audit. A properly designed industrial acoustic enclosure accounts for the installation environment, not just the machine’s rated sound power level.
TDS (Technical Data Sheet)
| Parameter | Specification |
|---|---|
| Product Type | Modular / Site-Fabricated Acoustic Enclosure |
| Acoustic Rating | 50 STC as per IS-9901 (Part III)-1981, DIN 52210 (Part IV)-1984, ISO 140 (Part III)-1995 |
| Noise Reduction | 25 to 40 dB(A) |
| Panel Material | 16 Gauge CRCA / GI Perforated Sheet |
| Insulation | Mineral wool / rockwool, multi-layer |
| Finish | Two-coat primer with automotive paint or powder coating |
| Ventilation | Fresh air inlet louvers + hot air exhaust fans |
| Lighting | Internal illumination at 300 LUX |
| Compliance | ISO 9001:2015, ISO 14001, CPCB noise norms |
Specifications, Benefits, Applications and Installation Process for Acoustic Enclosure
Myth vs Reality
| Myth | Reality |
|---|---|
| Thicker sheet always means quieter | Insulation layering matters more than sheet gauge |
| Any enclosure meets CPCB norms | Only STC-tested designs guarantee compliance |
| Enclosures block all airflow | Proper louvers allow cooling without noise leak |
| One size fits every generator | Enclosures need machine-specific acoustic design |
| Powder coating is only cosmetic | It also resists corrosion and extends service life |
How to Choose the Right Acoustic Enclosure Manufacturer in India
Ask three questions before signing a purchase order. First, will they share the STC test certificate and standard used, not just a noise reduction percentage. Second, have they executed a project of similar scale, ideally verifiable through a client list or site reference. Third, do they offer a post-installation acoustic validation report, since a noise reading taken before the machine is fully loaded is not representative. Suppliers who hesitate on any of these three points are usually selling a generic soundproof enclosure, not an engineered noise control solution.
Frequently Asked Questions
What is an acoustic enclosure used for?
It contains and reduces noise from machinery like DG sets, compressors, and turbines.
How much noise can an acoustic enclosure reduce?
Typically 25 to 40 dB(A), depending on design and machine type.
Is a soundproof enclosure the same as an acoustic enclosure?
Yes, both terms describe the same noise control product.
What material is used in acoustic enclosures?
16 gauge CRCA or GI perforated sheet with acoustic insulation inside.
Do acoustic enclosures affect generator cooling?
No, proper ventilation louvers maintain airflow without noise leakage.
What is the CPCB noise limit for DG sets?
75 dB(A) at one metre from the enclosure surface for sets up to 1000 kVA.
Can acoustic enclosures be customized for size?
Yes, enclosures are custom designed per machine dimensions and site layout.
How long do acoustic enclosures last?
With powder coating and proper maintenance, 10 to 15 years typically.
Are modular acoustic enclosures better than welded ones?
Modular units are faster to install and easier to relocate.
Who needs an industrial acoustic enclosure?
Any facility running loud machinery near residential zones or compliance audits.
Get a Custom Acoustic Enclosure Quote
Somnandi Industries designs and installs acoustic enclosures across India for power plants, manufacturing units, and testing labs. Contact our engineering team for a free site noise survey and a detailed quotation tailored to your machine and compliance requirements.
SomNandi Industries
Email: sales@somnandi.com
Phone: +91 98714 10959
Enquire Now for a Site Visit and Quote »