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2. Sound reduction index - Wikipedia

   en.wikipedia.org/wiki/Sound_Reduction_Index

   The sound reduction index is used to measure the level of sound insulation provided by a structure such as a wall, window, door, or ventilator. It is defined in the series of international standards ISO 16283 (parts 1-3) and the older ISO 140 (parts 1-14), or the regional or national variants on these standards.

3. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Outside the US, the ISO Sound Reduction Index (SRI) is used.

4. Architectural acoustics - Wikipedia

   en.wikipedia.org/wiki/Architectural_acoustics

   The typical sound paths are ceilings, room partitions, acoustic ceiling panels (such as wood dropped ceiling panels), doors, windows, flanking, ducting and other penetrations. Technical solutions depend on the source of the noise and the path of acoustic transmission , for example noise by steps or noise by (air, water) flow vibrations.

5. Acoustic foam - Wikipedia

   en.wikipedia.org/wiki/Acoustic_foam

   The objective of acoustic foam is to improve or change a room's sound qualities by controlling residual sound through absorption. [6] This purpose requires strategic placement of acoustic foam panels on walls, ceilings, floors and other surfaces.

6. WELL Building Standard - Wikipedia

   en.wikipedia.org/wiki/WELL_Building_Standard

   S05 Sound Reducing Surfaces, furnishing quality surfaces of room that meets criteria of tier 1 or 2, receiving 1 or 2 points, for example, open workspaces, minimum noise reduction coefficient (NRC) OR Alpha-w of 0.75 or 0.90 and minimum furniture height and NRC OR Alpha-w with minimum height of 1.2 m above finished floor and minimum 0.70 ...

7. Window insulation - Wikipedia

   en.wikipedia.org/wiki/Window_insulation

   Wood frame windows provide better insulation, but they are a poor choice for durability or maintenance (unless you choose wood-clad windows). Vinyl and fiberglass are better insulation and noise reduction materials. Certain windows have vinyl or fiberglass frames that feature chambers, to further enhance insulation and noise reduction. [5]