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2. Tested and Approved: The Best Air Conditioners for Staving ...

   www.aol.com/lifestyle/best-air-conditioners...

   The noise level is low to average. ... This is the quietest air conditioner we’ve tested. ... voice command built-in—while having a decent 11.6 CEER rating and minimal noise. It shoots air up ...

3. 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.

4. Ambient noise level - Wikipedia

   en.wikipedia.org/wiki/Ambient_noise_level

   Ambient noise level is measured with a sound level meter. [4] It is usually measured in dB relative to a reference pressure of 0.00002 Pa, i.e., 20 μPa (micropascals) in SI units. [5] This is because 20 μPa is the faintest sound the human ear can detect. [5] A pascal is a newton per square meter. The centimeter-gram-second system of units ...

5. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Noise control for aerodynamic sources include quiet air nozzles, pneumatic silencers and quiet fan technology. Since many mechanical sounds are inherently loud, the principal design element is to require the wall or ceiling assembly to meet certain performance standards, [ 21 ] (typically Sound transmission class of 50), which allows ...

6. Expert shopping: The quietest air purifiers - AOL

   www.aol.com/news/expert-shopping-quietest-air...

   The quietest air purifiers include options from Blueair, Dyson and Philips. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us ...

7. 15 products to help you stay cool in the extreme heat: 'A ...

   www.aol.com/lifestyle/products-to-help-you-stay...

   The BedJet is a favorite for sleeping if you don't have air conditioning. Basically, it's vents fresh air via a tube into a two-layer top sheet so you stay cool and dry while you sleep.