N95 respirator
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An N95 respirator is a disposable filtering facepiece respirator or reusable elastomeric respirator filter that meets the U.S. National Institute for Occupational Safety and Health N95 standard of air
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A Moldex 2200N95 disposable filtering facepiece respirator, with TC approval number on the strap, TC-84A-0327
Surgical N95 respirators for use in health care are both approved by NIOSH (as a respirator) and cleared by FDA (as a fluid resistant surgical mask), TC-84A-0006
The Hawks Nest Tunnel disaster memorial grave site
Corsi–Rosenthal Box
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The Corsi–Rosenthal Box is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It consists of four or five HVAC particulate air filters that form a cube and a box
N95 respirator
…a single strap (also known as a dust mask) or a mask with earloops. In addition to recommending NIOSH-approved respirators, the EPA also recommends building air purifiers to improve indoor air quality when commercial air purifiers are unavailable or unaffordable. As of October 2024, NIOSH is in the process of developing…
An example of a homemade unit
Richard Corsi in 2022
Students with decorated Corsi–Rosenthal Boxes at a competition at University of California, Davis in 2022