How Effective are Consumer-grade and Modified Masks Against COVID-19?

Researchers have tested consumer-grade and improvised face coverings to show how effective they are at protecting an individual from airborne particles of similar size to those carrying SARS-CoV-2. They used the recently described methodological approach based on the OSHA Fit Test to determine the fitted filtration efficiency. There have been several innovative hacks or mask enhancements used that claim improved filtration efficacy.

Here are the results of the filtration efficacy of different masks

Consumer-grade facemasks:

• 2-layer woven nylon mask, ear loops without aluminum nose bridge: 44.7%

• 2-layer woven nylon mask, ear loops, with aluminum nose bridge: 56.7%

• 2-layer woven nylon mask, ear loops, with nose bridge, 1 non-woven insert: 74.4%

• 2-later woven nylon mask, ear loops, with nose bridge, washed, no insert: 79%

• Cotton bandana – folded Surgeon General style: 50%

• Cotton bandana – folded “Bandit” style: 49 %

• Single-layer woven polyester gaiter/neck cover (balaclava bandana): 37.8%

• Single-layer woven polyester/nylon mask with ties: 39.7%

• Non-woven polypropylene mask with fixed ear loops: 28.6%

• Three-layer woven cotton mask with ear loops: 26.5%

Medical facemasks and modifications:

• 3M 9210 NIOSH-approved N95 Respirator: 98%

• Surgical mask with ties: 71.4%

• Procedure mask with ear loops: 38.5%

• Procedure mask with ear loops + “loops tied and corners tucked in”: 60.3%

• Procedure mask with ear loops + “Ear Guard”: 61.7%

• Procedure mask with ear loops + “23mm claw hair clip”: 64.8%

• Procedure mask with ear loops + “Fix-the Mask (3 rubber bands)”: 78.2%

• Procedure mask with ear loops + “nylon hosiery sleeve”: 80.2%

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Ref link: https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2774266

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