A quieter and more affordable DIY PAPR

Corrections: I have no reason to be confident that the filters are equivalent to N95, they could be a lot worse. Also, air leaving the hood should pass through cotton to protect other people uncase the wearer is sick with out, yet, knowing it. The main design is motor with USB power supply blowing into (or pulling air from) a HEPA filter attached to a bag with a window to see through. Be safe, and save lives. Including glue, the cost of materials is 72 dollars with manufactured hood (I underestimated in the video), 49 dollars if you make your own hood with a bag and 2 liter bottle, 41 dollars if you split the cost of the pump (the fans come in a two pack), and 12 dollars if you scavenge for everything except the filter, though likely 20 once for glue and tape used in putting things together. Please let me know if you would like a video for a specific part of the project. And, please share any tutorials that you make. Here is a list of materials used: Pump: $16 for 2, $8 if sharing: https://tinyurl.com/y4bnmln8 Available for 2.25 or less is buying at least 200 ($450 plus shipping). https://tinyurl.com/y6joflk7 Samples may be ordered for 4 dollars plus 18 dollars shipping if Amazon is out. Battery: 18.5 Wh Battery (should proved around 30 hours at 600 mW) for $11: https://tinyurl.com/y348sssd Filter: 3M Filtrete Hepa filter (this is HEPA if you trust 3M), $12. https://tinyurl.com/yyb6vxt2 This is an off brand filter that is labeled has HEPA, $17 for 3 or about $3 each is sharing. https://tinyurl.com/y56lmlzj Note: The filters below differ from what I used because I found sources that I think are more likely to meet the ASME HEPA standard for filtering at least 99.97 percent of small particles. One would have to test to be certain. Also, because I have not tested the filters, it is possible that the air flow will be reduced at 0.6W with a 5V power supply and the listed fan. The following device can be used to adjust voltage and (with the voltage) power of the fan: https://tinyurl.com/ycakrhpy Hood: (save 23 dollars by making out of a bag and 2 liter bottle for a window) https://tinyurl.com/yyrjqkul Glue: Silicone Caulk, $4 https://tinyurl.com/y528zpuo6 Epoxy, $6 https://tinyurl.com/y2nex6cn Additional parts that I assumed will be scabanged: A USB cord, to connect the fan to a 5V USB power pack. A plastic jar to connect the fan to a filter. A hat or fit the hood to your head, comfortably. If making your own hood: A 2 liter bottle. Sponge or foam weather stripping. Heavy-duty bag or other foundation for a mostly* air tight hood. *:Due to the positive pressure with a supply of about 2.5 liters per second, it's OK if there is a small amount of permeability to air. For example, waxed canvas from a duster would probably work well. If the material is difficult for air to get through, air will leak from the inside to the outside due to the positive** pressure on the inside. **:Positive pressure means that the air pressure is slightly greater than the sounding atmosphere.

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