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  2. Respirator - Wikipedia

    en.wikipedia.org/wiki/Respirator

    A CDC study found that in public indoor settings, consistently wearing a respirator was linked to a 83% lower risk of testing positive for COVID-19, as compared to a 66% reduction when using surgical masks, and 56% for cloth.

  3. Aimachi - Wikipedia

    en.wikipedia.org/wiki/Aimachi

    Aimachi is a Tenrikyo church based in Nagoya, Japan.Outside Japan, Aimachi is most known for its marching music and color guard ensembles. A selection from their 130-member marching band compete internationally as an indoor percussion ensembles, indoor marching ensembles, baton twirling, and winter guards.

  4. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    During the COVID-19 pandemic, the mask and respirator market rapidly grew, along with counterfeit respirators. [1] NIOSH, on behalf of the Department of Health and Human Services, filed a trademark application on June 17, 2020, for various 42 CFR 84 trademarks, including the N95, allowing NIOSH to enforce rules on counterfeit masks outside of rules defined in 42 CFR 84.

  5. Powered air-purifying respirator - Wikipedia

    en.wikipedia.org/wiki/Powered_air-purifying...

    some kind of headgear (mask or hood), a powered (motor-driven) fan which forces incoming air into the device, a filter (or multiple filters) for delivery to the user for breathing, and; a battery or other power source. The mask may be hard and tight-fitting, or flexible and loose-fitting.

  6. Indoor percussion ensemble - Wikipedia

    en.wikipedia.org/wiki/Indoor_percussion_ensemble

    An indoor percussion ensemble or indoor drumline is a type of marching ensemble consisting of battery and front ensemble instruments. [ 1 ] [ 2 ] It differs itself from a traditional percussion ensemble by not only on musical performance, but on theatrics and marching . [ 3 ]

  7. Rhythm X - Wikipedia

    en.wikipedia.org/wiki/Rhythm_X

    Rhythm X was the 2008, 2009, and 2013 WGI World Champion in Percussion Independent World (PIW) Class [6] and is well-known to indoor marching percussion fans and participants around the world as consistently one of the most highly skilled competitors. The percussion ensemble has also gained a reputation for presenting some of the most ...

  8. Winter Guard International - Wikipedia

    en.wikipedia.org/wiki/Winter_Guard_International

    Winter Guard International (WGI) is an American governing body that sanctions championship events for three competitive performing arts activities: winter guard, percussion ensembles, and indoor wind ensembles. WGI was founded in 1977 in response to inconsistent adjudication and rules of competition which made it difficult for color guards to ...

  9. Lists of tuned and untuned percussion instruments - Wikipedia

    en.wikipedia.org/wiki/Lists_of_tuned_and_untuned...

    This is a partitioned list of percussion instruments showing their usage as tuned or untuned. See pitched percussion instrument for discussion of the differences between tuned and untuned percussion. The term pitched percussion is now preferred to the traditional term tuned percussion: Each list is alphabetical.