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2. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   The Outdoor–Indoor Transmission Class (OITC) is a standard used for indicating the rate of sound transmission from outdoor noise sources into a building. It is based on the ASTM E-1332 Standard Classification for Rating Outdoor-Indoor Sound Attenuation. [ 37 ]

3. Buy Quiet - Wikipedia

   en.wikipedia.org/wiki/Buy_Quiet

   Buy Quiet is an American health and safety initiative to select and purchase the lowest noise emitting power tools and machinery in order to reduce occupational and community noise exposure. Buy Quiet Programs are examples of noise control strategies. [ 1 ]

4. Acoustic panel - Wikipedia

   en.wikipedia.org/wiki/Acoustic_panel

   Acoustic panel installation in a conference room, to reduce office ceiling echo Soundproofing in a studio isolation booth. Acoustic panels (also sound absorption panels, soundproof panels or sound panels) are sound-absorbing fabric-wrapped boards designed to control echo and reverberation in a room. [1]

5. Sound attenuator - Wikipedia

   en.wikipedia.org/wiki/Sound_attenuator

   A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

6. Acoustic plaster - Wikipedia

   en.wikipedia.org/wiki/Acoustic_plaster

   Most acoustic plasters have a Noise Reduction Coefficient between 0.5 and 1.00. [3] The Noise Reduction Coefficient (NRC) determines the ability of a material to reflect or absorb sound. [ 5 ] It is a number between 0 and 1, which 0 being perfectly reflective and 1 being perfectly absorptive. [ 5 ]

7. Architectural acoustics - Wikipedia

   en.wikipedia.org/wiki/Architectural_acoustics

   Fabric can be wrapped around substrates to create what is referred to as a "pre-fabricated panel" and often provides good noise absorption if laid onto a wall. Prefabricated panels are limited to the size of the substrate ranging from 2 by 4 feet (0.61 m × 1.22 m) to 4 by 10 feet (1.2 m × 3.0 m).