Health care N95 or P2
N stand for not oil restraint
3M 62023HA1-C-Respirator.jpg
Disposal not good seal
3m 6000
HEALTH WARNING – HEPA FILTER MASK
Dr Simon Freilich
I remain unconvinced that even if you found a safe filter material – that you will actually be sucking air through it. We inspire with relatively low pressures (~5cm H20) and for a homemade mask without a tight seal – the resistance of air through the material will be greater than of the air around it, so you’ll only end up breathing ‘unfiltered air’.
There are opinions and advice that even a simple cloth barrier over your face is better than nothing at all. There is a good rationale to this in both 1. Stopping the spread of small virus laden droplets being exhaled 2. forming a partial barrier to inhalation by someone else 3.Simply stopping people touching their face. The unfortunate reality, having looked through the research, is that home made masks are only marginally better than no masks at all. Hence the best protection is to stay away from other people as far as possible (obviously this is difficult for many but that’s literally the best method).
Hoover company to see if the bags I’ve been using have glass in them. Hoover AH10363 commercial do NOT have glass in them!
order for a filter to be certified as HEPA it needs to catch 99.7% of all particles .3 microns and larger, which is the exact same specifications as the filters used in the n95. 1 layer of hepa filter is equivalent. If you were using merv 13 filters then you would need 4 layers as the equivalent. Even though the many of the vacuum hepa filters and hepa air filters DO NOT USE FIBERGLASS,
1-hepa filters made out of fiberglass. The cost of this material is 5.00 usd /kg 2-hepa filters made out of meltblown nonwoven 20 to 35 gsm(grams per square meter) . The cost of this material is or was 65 usd /kg fob( free on board) Hubei. One kg of filter per 1000 masks n95 type. this is a problem when a specialist gets out of his tunnel visi
Here is a response from the makers of Filtrete: “Our filters are made from Polypropylene plastic fibers and strands, adhesive, paperboard, and for some filters, metal wire. There is no Fiberglass in our Filters. However, our Filtrete brand products are designed to be used in your home and your HVAC systems. The filter media in a Filtrete brand filter performs very differently than an approved N95 respirator or mask. It cannot achieve the fit or performance of a mask or N95 respirator and modifying the furnace filter may damage the material. 3M does not recommend or support the use of a Filtrete brand filter to make a mask or respirator.” So, they dispute the nonsense in this video that they are made with fiberglass. But of course they are unwilling to assume liability by telling people to use their products for uses other than they were intended for. This is not surprising. But if you are choosing your facemask material between pillowcases (not approved for facemasks), T-shirts (not approved for facemasks), quilting fabric (not approved for facemasks), or HEPA filters (not approved for facemasks)….. an intelligent choice awaits you.
It its confusing so I’d go with a cut to fit airconditioner filter from 3M it has to be a hepa filter which is the highest rating like p-100 and filters out 99.97% of particles and has a higher rate of working against the virus than an N 95 mask which filters 95% about to 97% of particulates. This hepa filter from 3M can filter down to 0.3 microns
https://www.3m.com/3M/en_US/safety-centers-of-expertise-us/respiratory-protection/respirator-selection/
My mask respirator is 50 APF (assigned protection factor)
Facepiece is 10 APF
Choose a Cartridge and/or Filter
Read about “Cartridge Change Schedules for Low Exposure Environments” (PDF, 286.66 KB)
Understanding the different types of particulate filters and gas and vapor cartridges can help you select the right one. NIOSH categories and labels are useful systems to learn about.
or particulate filters, NIOSH has 10 different categories, nine for negative-pressure filters and one for for powered air-purifying filters [PAPRs]).
The negative-pressure categories are based on a combination of two factors:
• Resistance to oily mists. This is indicated by a letter (N, R or P). N-class filters are not resistant to oil. R-class filters are oil-resistant, but they may only be used against oily mists for up to eight hours. P-class filters are oil-proof; time-use limitations must be determined by the manufacturer. 3M recommends 40 hours of use or 30 days, whichever occurs first, for its P-class filters.
• Filtration efficiency. Filters will be rated 95, 99 or 100. This means when used properly, they are capable of filtering at least 95%, 99% or 99.97% of airborne particles.
For PAPR filters, there is single particulate filtration classification referred to as HEPA or HE. High Efficiency Particulate Air or HEPA filters provide at least 99.97% filtration for all particulates.
For gas and vapor cartridges, NIOSH has a color-coding system to help you identify the correct equipment for your specific hazard. For example some common colors are:
• Organic vapors from solvents, such as those in paints and thinners, require a cartridge with a black label.
• Cartridges approved for acid gases, include gasses such as chlorine, hydrogen sulfide and sulfur dioxide, have a white label.
• Yellow-labeled cartridges are approved for both organic vapors and acid gases.
• Cartridges approved for ammonia or methylamine have a green label.