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
PLANNING CHECKLIST
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 CONTROLS
NOISE CONTROL OPTIONS
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.
BARRIERS
Noise 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
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:
BARRIER BACKED COMPOSITE
A reinforced loaded vinyl noise 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 SEPTUM COMPOSITE
A 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.
ENCLOSURES
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
Unlimited size, design and features
Multiple panel types to meet your specific requirements
Interior or exterior use
Electric posts available for outlets and switches
Single leaf and double leaf doors
Sliding doors, pocket doors and bi-fold doors available
Hinged and removable access plugs
Removable panels
Single glazed or double glazed windows
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.
ENGINEERING CONTROLS
METHODS
Source Treatment
Transmission Path Treatment
Receiver Treatment
SOURCE TREATMENT
ACOUSTICAL ENCLOSURE - METAL
When to use: radiated machine noise
Estimated Noise Reduction: 15-25 dba
SOURCE TREATMENT
ACOUSTICAL ENCLOSURE - CURTAIN
When to use: radiated machine noise
Estimated Noise Reduction: 8-12 dba
SOURCE TREATMENT
VIBRATION ISOLATORS
When to use: structural vibration noise
Estimated Noise Reduction: 3-10 dba
SOURCE TREATMENT
DUCT LAGGING
When to use: radiated HVAC noise
Estimated Noise Reduction: 5-15 dba
PATH TREATMENT
BARRIER WALL
When to use:
directional radiated machine noise
Estimated Noise Reduction: 10-15 dba
PATH TREATMENT
SILENCERS/LOUVERS
When to use:
HVAC intake/exhaust noise and air blowoff
Estimated Noise Reduction: 5-25 dba
PATH TREATMENT
ABSORPTION PANELS
When to use: reverberation noise
Estimated Noise Reduction: 2-5 dba
PATH TREATMENT
BAFFLES
When to use: reverberation noise
Estimated Noise Reduction: 2-5 dba
RECEIVER TREATMENT
ISOLATION ROOM
When to use: radiated machine noise
Estimated Noise Reduction: 15-25 dba
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