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the 8511 masks used in construction have a one-way valve for free-flow exhalation. The mask only protects the wearer from particulates in the environment. It do
by no-s 7y ago
the 8511 masks used in construction have a one-way valve for free-flow exhalation. The mask only protects the wearer from particulates in the environment. It doesn't protect the environment from particulates exhaled by the wearer. These would not be suitable for use by healthcare workers.
- RegnisGnaw 7y agoThe 3M 8210 N95 respirator which I referenced above doesn’t have a valve.
- no-s 7y agonevertheless 8511 masks disappeared from the market, and Amazon is telling me they are available only to gov't and institutions. On eBay the masks are listed at over $25 apiece. Unfortunately when doing dusty work one mask will only last for a day or less. I started having trouble sourcing these in late January.
- no-s 7y agoit turns out I have everything I need to manufacture small qty runs (100s) of effective masks at about $1.60ea. So I'm just going to do it to stock up my household for the duration. QC is my only concern, since I have to use a qualitative test (smell the bacon frying).