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Acoustic Steel Door | Soundproof Metal Door Manufacturer in India
Steel Acoustic Doors & Soundproof Metal Doors for Industrial & Commercial Buildings
Summary: An acoustic steel door, also called a soundproof door or sound proof metal door, is a heavy steel door with a rock wool-filled leaf, a steel frame, and continuous gaskets and drop seals, built to stop sound passing through a doorway. Ecotone acoustic doors are 65 mm to 100 mm thick with STC ratings from 36 to 50, laboratory tested to IS 9901 Part III, DIN 52210 Part IV, and ISO 140 Part III, with fire-rated options and acoustic vision panels. This page is for plant engineers, architects, and studio owners choosing an acoustic door.
- STC 36 to 50, lab tested to IS 9901 and ISO 140
- Design, manufacture, installation & commissioning
- ISO 9001:2015 certified manufacturer
Get a project quote
Tell us about your requirement and site. Our team typically responds within 24 hours on business days.
Is This Acoustic Door Guide Right for You?
Who It's For
Generator and compressor rooms, plant rooms, test cells, control rooms, studios, auditoriums, conference rooms, hospitals, and commercial buildings that need a soundproof doorway.
When to Use This Guide
Before choosing door thickness and STC rating, while comparing acoustic door quotes, or when an existing door is leaking noise around its edges.
What Is an Acoustic Steel Door?
An acoustic door, also called a soundproof door, acoustic steel door, or sound proof metal door, is a door built to block sound as well as a wall would. Ecotone’s steel acoustic doors have a shutter of 16 or 18 SWG CRCA or GI sheet (about 1.6 or 1.2 mm), a cavity filled with high-density rock wool, and a frame of mild steel pipe or ISMC profile on three sides. Neoprene or EPDM gaskets, special astragals, and automatic door drop seals close the gaps around the leaf. Doors are made 65 mm to 100 mm thick, giving STC 36 to 50, with single or double leaf, fire-rated options, and acoustic glass vision panels. If you needed the one-line definition, that is it. The sections below cover what makes an acoustic door perform once it is installed.
Why the Door Is Usually the Weakest Point in a Soundproof Room
A well-built wall can block a great deal of sound, but an ordinary door with gaps around it can let most of that noise straight through. In generator rooms, compressor houses, test cells, and studios, the door is often the reason a room fails its noise target. A soundproof door with a dense, insulated leaf and continuous seals brings the doorway closer to the wall’s performance. Steel acoustic doors also last longer than wooden ones, resist fire better, and need less maintenance, which is why industry prefers them. For doors that also need airflow, see acoustic louvered doors.
Specifications, Benefits, Applications & Installation Process
| Parameter | Standard Specification |
|---|---|
| Door Thickness | 65 mm to 100 mm |
| Acoustic Rating | STC 36 to 50 |
| Shutter | 16 or 18 SWG CRCA or GI sheet |
| Infill | High-density rock wool |
| Frame | MS pipe or ISMC profile, three sides |
| Seals | Neoprene or EPDM gaskets, astragals, drop seal |
| Vision Panel | Optional acoustic double glazing |
| Finish | Powder coating, PU paint, or spray paint |
| Benefit | Impact |
|---|---|
| High Sound Insulation | STC up to 50 |
| Sealed Edges | Gaskets and drop seals stop leaks |
| Fire-Rated Options | Added protection for people and property |
| Durability | Steel construction, long service life |
| Visibility | Acoustic vision panels available |
| Custom Sizes | Single or double leaf, any opening |
| Lab Tested | IS 9901, DIN 52210, ISO 140 |
| Application | Typical Space |
|---|---|
| Generator and DG Rooms | Plant and utility buildings |
| Compressor and Pump Rooms | Industrial plants |
| Test Cells | Engine and product testing |
| Control Rooms | Operator spaces |
| Studios | Recording and broadcast |
| Auditoriums and Conference Rooms | Commercial buildings |
| Hospitals | Plant rooms and quiet zones |
| Step | Action |
|---|---|
| 1. Requirement | Define STC target, fire rating, and opening size |
| 2. Door Selection | Choose thickness, leaf, and vision panel |
| 3. Frame Design | MS pipe or ISMC frame for the wall type |
| 4. Fabrication | Shutter, infill, and seals assembled |
| 5. Finishing | Powder coat, PU, or spray paint |
| 6. Installation | Frame fixed and grouted, leaf hung |
| 7. Seal Adjustment | Gaskets and drop seal set for full contact |
Technical Data Sheet
| Property | Value / Standard |
|---|---|
| Product | Steel Acoustic Door |
| Thickness | 65 to 100 mm |
| STC Rating | 36 to 50 |
| Testing | IS 9901 Part III, DIN 52210 Part IV, ISO 140 Part III |
| Sheet | 1.2 mm or 1.6 mm GI or CRCA |
| Core | High-density rock wool |
| Frame | MS pipe or ISMC, three sides |
| Seals | Neoprene or EPDM, astragals, drop seal |
| Hardware | Heavy-duty hinges, locks, panic bars, D-handles |
| Options | Fire rating, double-glazed vision panel |
How Does a Soundproof Door Block Sound?
Short answer: The heavy steel leaf and rock wool core stop sound passing through the door, and the gaskets, astragals, and drop seal close the gaps around it, which is where most sound normally leaks.
Mass
Steel skins add weight that resists sound.
Absorption
Rock wool damps sound inside the leaf.
Perimeter Seals
Gaskets close the frame gaps.
Drop Seal
Seals the floor gap when the door closes.
STC Rating vs Real-World Performance
Short answer: A lab STC figure is the best case; on site, gaps, a poorly grouted frame, or a weak wall around the door reduce it, so installation matters as much as the door.
STC is measured in a laboratory with the door perfectly installed. On site, an ungrouted hollow frame, a misaligned leaf, worn seals, or a floor that is not level for the drop seal can each cost several decibels. The surrounding wall must also be at least as good as the door. When choosing between STC 36 and STC 50, match the door to the wall and the noise problem rather than buying the highest number.
Seals, Hardware, and Vision Panels
Neoprene or EPDM gaskets must stay in full contact around the frame, and the automatic drop seal must meet the floor evenly. Heavy-duty hinges keep the leaf aligned under its weight, and panic bars and locks are selected to suit the room’s use. Vision panels use double glazing so visibility does not compromise insulation. Ask how seals are adjusted and replaced over the door’s life.
Ecotone Systems: Design, Manufacture, Installation, and Commissioning
Ecotone Systems is an ISO 9001:2015 certified manufacturer of acoustic steel doors, blast proof doors, and gas air tight doors, supplying doors on their own or as part of acoustic enclosures and test cells across India.
How to Choose an Acoustic Door Manufacturer in India
Ask for the Test Report
Request the STC test report for the exact door build.
Match STC to the Wall
The wall must perform at least as well as the door.
Check Seals
Confirm gasket material, astragals, and drop seal.
Confirm Frame and Grouting
Ask how the frame is fixed and filled.
Review Fire Rating
Check fire rating where required.
See Similar Installations
Ask for DG room, studio, or test cell references.
Frequently Asked Questions
A door built to block sound, with a dense insulated leaf and sealed edges.
Sound Transmission Class; higher numbers mean better sound blocking.
STC 36 to 50, depending on thickness and build.
65 mm to 100 mm.
High-density rock wool between steel sheets.
Yes, fire-rated options are available.
Yes, double-glazed acoustic vision panels are available.
Powder coating, PU paint, or spray paint.
Generally ₹1,500 to ₹20,000 per m², or ₹25,000 to ₹1,00,000 per custom or fire-rated door.
Usually, with better durability, fire resistance, and lower maintenance.
Get a Project Quote for Acoustic Steel Doors
Whether you need a soundproof door for a generator room, a studio, or a test cell, Ecotone Systems manufactures and installs acoustic doors to the STC rating, size, and fire rating you need. Tell us the opening size and noise problem, and our team typically responds within 24 hours on business days.
Sealed doors for cleanrooms, labs and CA storage.
Personnel doors with built-in acoustic ventilation.
Door assemblies rated for blast overpressure and fire.
Doors tested as per EN 1522 FB6 for high-security sites.
Prefabricated cleanrooms built to ISO 14644-1 classes.
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