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Shelby County Health Department - "#Masks with #ExhalationValves or #ExhalationVents: The purpose of masks is to keep #respiratorydroplets from reaching others to aid with source control. However, masks with one-way valves or
Avoid wearing coronavirus face masks with vents, valves, CDC says in updated guidance
CDC warns masks with valves, vents don't prevent spread of COVID-19
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CDC: Do not wear face masks with one-way valves or vents
Is the N95 Face Mask the Best Mask for Wildfire Smoke? - Molekule
:max_bytes(150000):strip_icc()/GettyImages-1216577437-c8f8b935a9d34517a016f338e6a5256e.jpg "CDC Discourages Use of Face Masks With Vents and Valves")
CDC Discourages Use of Face Masks With Vents and Valves
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CDC: Masks With Valves or Vents Not Effective
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CDC: Don't Wear Masks with Vents or Valves | Moffitt
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Face masks with valves or vents do not prevent spread of coronavirus, CDC says | The Seattle Times
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