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A kitchen hood in a small apartment. A kitchen hood, exhaust hood, hood fan, extractor hood, or range hood is a device containing a mechanical fan that hangs above the stove or cooktop in the kitchen. It removes airborne grease, combustion products, fumes, smoke, heat, and steam from the air by evacuation of the air and filtration. [1]
One Square Inch of Silence is a noise control project symbolized by a small red stone symbolically placed in Hoh Rainforest at Olympic National Park in 2005 by author and sound recording specialist Gordon Hempton. [1] [2] [3] The stone's location has been called "the quietest place in the United States".
Fume hoods are a major factor in making laboratories four to five times more energy intensive than typical commercial buildings, [64] and these energy requirements are exacerbated in hot and humid climates. [65] Energy costs for a typical hood can range from $4,600/year in Los Angeles to $9,300/year in Singapore based on differences in cooling ...
The be quiet! trademark was registered in 2002 by Listan GmbH. Initially only PC power supplies equipped with noise-minimizing technology were marketed under the brand name. From 2008, it was decided to add products for the cooling of PCs (CPU coolers and case fans) to the be quiet! range in addition to power supplies.
It is approximately the quietest sound a young human with undamaged hearing can detect at 1 kHz. [4] The threshold of hearing is frequency-dependent and it has been shown that the ear's sensitivity is best at frequencies between 2 kHz and 5 kHz, [5] where the threshold reaches as low as −9 dB SPL. [6] [7] [8]
Silent running is a stealth mode of operation for naval submarines.The aim is to evade discovery by passive sonar by eliminating superfluous noise: nonessential systems are shut down, the crew is urged to rest and refrain from making any unnecessary sound, and speed is greatly reduced to minimize propeller noise.