2. AMERICAS TOTAL NOISE CONTROL COMPANY

3. 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.

4. 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

5. ENGINEERING CONTROLS NOISE CONTROL OPTIONS Absorbers Barriers Composites Enclosures Lag Treatment

6. 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.

7. 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

8. 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:

9. 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.

10. 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.

11. 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

12. 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.

13. ENGINEERING CONTROLS Source Treatment Transmission Path Treatment Receiver Treatment METHODS

14. SOURCE TREATMENT ACOUSTICAL ENCLOSURE - METAL When to use: radiated machine noise Estimated Noise Reduction: 15-25 dba

15. SOURCE TREATMENT ACOUSTICAL ENCLOSURE - CURTAIN When to use: radiated machine noise Estimated Noise Reduction: 8-12 dba

16. SOURCE TREATMENT VIBRATION ISOLATORS When to use: structural vibration noise Estimated Noise Reduction: 3-10 dba

17. SOURCE TREATMENT DUCT LAGGING When to use: radiated HVAC noise Estimated Noise Reduction: 5-15 dba

18. PATH TREATMENT BARRIER WALL When to use: directional radiated machine noise Estimated Noise Reduction: 10-15 dba

19. PATH TREATMENT SILENCERS/LOUVERS When to use: HVAC intake/exhaust noise and air blowoff Estimated Noise Reduction: 5-25 dba

20. PATH TREATMENT ABSORPTION PANELS When to use: reverberation noise Estimated Noise Reduction: 2-5 dba

21. PATH TREATMENT BAFFLES When to use: reverberation noise Estimated Noise Reduction: 2-5 dba

22. RECEIVER TREATMENT ISOLATION ROOM When to use: radiated machine noise Estimated Noise Reduction: 15-25 dba

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