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 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

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?

PLANNING CHECKLIST

ENGINEERING CONTROLSNOISE CONTROL OPTIONS

AbsorbersBarriersCompositesEnclosuresLag Treatment

ABSORBERSSound 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.

BARRIERSNoise 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 are available in various densities

COMPOSITESAcoustical 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:

BARRIER BACKED COMPOSITEA reinforced loaded vinyl noise barrier with a quilted fiberglassabsorber 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 SEPTUM COMPOSITEA non-reinforced loaded vinyl noise 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.

ENCLOSURESModular 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

Unlimited size, design and featuresMultiple panel types to meet your specific requirementsInterior or exterior useElectric posts available for outlets and switchesSingle leaf and double leaf doorsSliding doors, pocket doors and bi-fold doors availableHinged and removable access plugsRemovable panelsSingle glazed or double glazed windows

LAG TREATMENTUsed 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.

ENGINEERING CONTROLS

Source Treatment

Transmission Path Treatment

Receiver Treatment

METHODS

SOURCE TREATMENTACOUSTICAL ENCLOSURE - METAL

When to use: radiated machine noiseEstimated Noise Reduction: 15-25 dba

SOURCE TREATMENTACOUSTICAL ENCLOSURE - CURTAIN

When to use: radiated machine noiseEstimated Noise Reduction: 8-12 dba

SOURCE TREATMENTVIBRATION ISOLATORS

When to use: structural vibration noiseEstimated Noise Reduction: 3-10 dba

SOURCE TREATMENTDUCT LAGGING

When to use: radiated HVAC noiseEstimated Noise Reduction: 5-15 dba

PATH TREATMENTBARRIER WALL

When to use: directional radiated machine noise

Estimated Noise Reduction: 10-15 dba

PATH TREATMENTSILENCERS/LOUVERS

When to use: HVAC intake/exhaust noise and air blowoff

Estimated Noise Reduction: 5-25 dba

PATH TREATMENTABSORPTION PANELS

When to use: reverberation noiseEstimated Noise Reduction: 2-5 dba

PATH TREATMENTBAFFLES

When to use: reverberation noiseEstimated Noise Reduction: 2-5 dba

RECEIVER TREATMENTISOLATION ROOM

When to use: radiated machine noiseEstimated Noise Reduction: 15-25 dba

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