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  2. Kitchen hood - Wikipedia

    en.wikipedia.org/wiki/Kitchen_hood

    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]

  3. Loudspeaker enclosure - Wikipedia

    en.wikipedia.org/wiki/Loudspeaker_enclosure

    MTX Audio loudspeaker enclosures (with rear panel reflex port tubes) which can mount 15-inch woofers, mid-range drivers and horn and/or compression tweeters. In this photo, only one driver is mounted. A cabinet with loudspeakers mounted in the holes. Number 1 is a mid-range driver. Number 2 is a high-range driver.

  4. Absolute threshold of hearing - Wikipedia

    en.wikipedia.org/wiki/Absolute_threshold_of_hearing

    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]