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AMERICA’S TOTAL NOISE CONTROL COMPANY. Sound pressure is measured in a unit called decibels and is often abbreviated dB. Zero decibels is the lowest sound a person can hear. . A pin drop is 10 dB A shower is 70 dB A squeeze toy is 90 dB .

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Sound pressure is measured in a unit called decibels and is often abbreviated dB. Zero decibels is the lowest sound a person can hear.

  • A pin drop is

    • 10 dB

  • A shower is

    • 70 dB

  • A squeeze toy is

    • 90 dB

Each ten decibel increment means the harm to you is amplified ten times. Noise of 85 dB is considered harmful to a person's ears, and protection is recommended to prevent damage to the eardrum, according to OSHA Standards. A person may not realize this since the ear begins to hurt at about 120 decibels.


Engineering controls

PLANNING CHECKLIST often abbreviated

ENGINEERING CONTROLS

  • How much noise reduction is required?

  • What frequency needs to be attenuated?

  • What are the operational considerations?

  • What are the transmission paths?

  • What is the physical environment?

  • What are the aesthetic requirements?


Engineering controls1

NOISE CONTROL OPTIONS often abbreviated

ENGINEERING CONTROLS

  • Absorbers

  • Barriers

  • Composites

  • Enclosures

  • Lag Treatment


Absorbers

Sound absorbers are soft, porous, open-celled materials such as Baffles or Quilted Fiberglass blankets that reduce the reflection of sound waves by allowing them to soak in and dissipate.

ABSORBERS


Barriers

Noise as Baffles or Quilted Fiberglass blankets that reduce the reflection of sound Barriers combine mass, flexibility and limpness to block noise from transmitting from one area to another. Barriers are available either non-reinforced or reinforced.

BARRIERS

Barriers are available in various densities


Composites

Acoustical curtain panels combine both Noise Barrier & Sound Absorber materials. Typically, they offer the maximum Noise Reduction per dollar spent…up to a 22 dB(A) noise reduction

There are typically two common types of acoustical curtain panels:

COMPOSITES


Barrier backed composite

A reinforced loaded vinyl Absorber materials. Typically, they offer the maximum Noise Reduction per dollar spent…up to a 22 dB(A) noise reductionnoise barrier with a quilted fiberglass

absorber on one side. Superior acoustical performance and maximum durability. Curtain panels are constructed with grommets across the top and Velcro along the vertical edges.

BARRIER BACKED COMPOSITE


Barrier septum composite

A non-reinforced loaded vinyl Absorber materials. Typically, they offer the maximum Noise Reduction per dollar spent…up to a 22 dB(A) noise reductionnoise barrier sandwiched between two layers of quilted fiberglass. Use for sound absorption on both sides of product, or as a decoupled/barrier/absorber acoustical liner. Curtain panels are constructed with grommets across the top and Velcro along the vertical edges.

BARRIER SEPTUM COMPOSITE


Enclosures

Unlimited size, design and features Absorber materials. Typically, they offer the maximum Noise Reduction per dollar spent…up to a 22 dB(A) noise reduction

Multiple panel types to meet your specific requirements

Interior or exterior use

Electric posts available for outlets and switches

Single leafand double leafdoors

Sliding doors, pocket doorsand bi-folddoorsavailable

Hinged and removable access plugs

Removable panels

Single glazed or double glazed windows

Modular panels with grommets at top and velcro seals along each edge allow for any configuration required

A variety of mounting hardware allows for floor, wall, ceiling, or suspended acoustical curtain framing options

Open topped enclosures and portable enclosures

Complete enclosures with roofs and ventilation packages

ENCLOSURES


Lag treatment

Used to wrap noisy pipes and ducts to block the noise that transmits through the walls of the pipe or duct as air or other contents move through it.

LAG TREATMENT


Engineering controls2

METHODS transmits through the walls of the pipe or duct as air or other contents move through it.

ENGINEERING CONTROLS

  • Source Treatment

  • Transmission Path Treatment

  • Receiver Treatment


Source treatment

ACOUSTICAL ENCLOSURE - METAL transmits through the walls of the pipe or duct as air or other contents move through it.

SOURCE TREATMENT

When to use: radiated machine noise

Estimated Noise Reduction: 15-25 dba


Source treatment1

ACOUSTICAL ENCLOSURE - CURTAIN transmits through the walls of the pipe or duct as air or other contents move through it.

SOURCE TREATMENT

When to use: radiated machine noise

Estimated Noise Reduction: 8-12 dba


Source treatment2

VIBRATION ISOLATORS transmits through the walls of the pipe or duct as air or other contents move through it.

SOURCE TREATMENT

When to use: structural vibration noise

Estimated Noise Reduction: 3-10 dba


Source treatment3

DUCT LAGGING transmits through the walls of the pipe or duct as air or other contents move through it.

SOURCE TREATMENT

When to use: radiated HVAC noise

Estimated Noise Reduction: 5-15 dba


Path treatment

BARRIER WALL transmits through the walls of the pipe or duct as air or other contents move through it.

PATH TREATMENT

When to use:

directional radiated machine noise

Estimated Noise Reduction: 10-15 dba


Path treatment1

SILENCERS/LOUVERS transmits through the walls of the pipe or duct as air or other contents move through it.

PATH TREATMENT

When to use:

HVAC intake/exhaust noise and air blowoff

Estimated Noise Reduction: 5-25 dba


Path treatment2

ABSORPTION PANELS transmits through the walls of the pipe or duct as air or other contents move through it.

PATH TREATMENT

When to use: reverberation noise

Estimated Noise Reduction: 2-5 dba


Path treatment3

BAFFLES transmits through the walls of the pipe or duct as air or other contents move through it.

PATH TREATMENT

When to use: reverberation noise

Estimated Noise Reduction: 2-5 dba


Receiver treatment

ISOLATION ROOM transmits through the walls of the pipe or duct as air or other contents move through it.

RECEIVER TREATMENT

When to use: radiated machine noise

Estimated Noise Reduction: 15-25 dba


www.ies2000.com transmits through the walls of the pipe or duct as air or other contents move through it.


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